mirror of
https://github.com/RPCS3/llvm.git
synced 2025-01-11 15:08:16 +00:00
a34cab9be7
Example:
define i1 @foo(i32 %a) {
%shr = ashr i32 -9, %a
%cmp = icmp ne i32 %shr, -5
ret i1 %cmp
}
Before this fix, the instruction combiner wrongly thought that %shr
could have never been equal to -5. Therefore, %cmp was always folded to 'true'.
However, when %a is equal to 1, then %cmp evaluates to 'false'. Therefore,
in this example, it is not valid to fold %cmp to 'true'.
The problem was only affecting the case where the comparison was between
negative quantities where one of the quantities was obtained from arithmetic
shift of a negative constant.
This patch fixes the problem with the wrong folding (fixes PR20945).
With this patch, the 'icmp' from the example is now simplified to a
comparison between %a and 1. This still allows us to get rid of the arithmetic
shift (%shr).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217950 91177308-0d34-0410-b5e6-96231b3b80d8
693 lines
16 KiB
LLVM
693 lines
16 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-p:64:64:64-p1:16:16:16-p2:32:32:32-p3:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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; CHECK-LABEL: @exact_lshr_eq_both_zero
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; CHECK-NEXT: ret i1 true
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define i1 @exact_lshr_eq_both_zero(i8 %a) {
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%shr = lshr exact i8 0, %a
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%cmp = icmp eq i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_ashr_eq_both_zero
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; CHECK-NEXT: ret i1 true
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define i1 @exact_ashr_eq_both_zero(i8 %a) {
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%shr = ashr exact i8 0, %a
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%cmp = icmp eq i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @nonexact_lshr_eq_both_zero
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; CHECK-NEXT: ret i1 true
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define i1 @nonexact_lshr_eq_both_zero(i8 %a) {
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%shr = lshr i8 0, %a
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%cmp = icmp eq i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @nonexact_ashr_eq_both_zero
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; CHECK-NEXT: ret i1 true
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define i1 @nonexact_ashr_eq_both_zero(i8 %a) {
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%shr = ashr i8 0, %a
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%cmp = icmp eq i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_lshr_ne_both_zero
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; CHECK-NEXT: ret i1 false
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define i1 @exact_lshr_ne_both_zero(i8 %a) {
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%shr = lshr exact i8 0, %a
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%cmp = icmp ne i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_ashr_ne_both_zero
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; CHECK-NEXT: ret i1 false
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define i1 @exact_ashr_ne_both_zero(i8 %a) {
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%shr = ashr exact i8 0, %a
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%cmp = icmp ne i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @nonexact_lshr_ne_both_zero
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; CHECK-NEXT: ret i1 false
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define i1 @nonexact_lshr_ne_both_zero(i8 %a) {
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%shr = lshr i8 0, %a
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%cmp = icmp ne i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @nonexact_ashr_ne_both_zero
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; CHECK-NEXT: ret i1 false
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define i1 @nonexact_ashr_ne_both_zero(i8 %a) {
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%shr = ashr i8 0, %a
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%cmp = icmp ne i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_lshr_eq_last_zero
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; CHECK-NEXT: ret i1 false
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define i1 @exact_lshr_eq_last_zero(i8 %a) {
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%shr = lshr exact i8 128, %a
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%cmp = icmp eq i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_ashr_eq_last_zero
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; CHECK-NEXT: ret i1 false
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define i1 @exact_ashr_eq_last_zero(i8 %a) {
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%shr = ashr exact i8 -128, %a
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%cmp = icmp eq i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_lshr_ne_last_zero
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; CHECK-NEXT: ret i1 true
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define i1 @exact_lshr_ne_last_zero(i8 %a) {
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%shr = lshr exact i8 128, %a
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%cmp = icmp ne i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_ashr_ne_last_zero
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; CHECK-NEXT: ret i1 true
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define i1 @exact_ashr_ne_last_zero(i8 %a) {
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%shr = ashr exact i8 -128, %a
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%cmp = icmp ne i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @nonexact_lshr_eq_last_zero
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; CHECK-NEXT: ret i1 false
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define i1 @nonexact_lshr_eq_last_zero(i8 %a) {
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%shr = lshr i8 128, %a
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%cmp = icmp eq i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @nonexact_ashr_eq_last_zero
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; CHECK-NEXT: ret i1 false
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define i1 @nonexact_ashr_eq_last_zero(i8 %a) {
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%shr = ashr i8 -128, %a
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%cmp = icmp eq i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @nonexact_lshr_ne_last_zero
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; CHECK-NEXT: ret i1 true
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define i1 @nonexact_lshr_ne_last_zero(i8 %a) {
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%shr = lshr i8 128, %a
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%cmp = icmp ne i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @nonexact_ashr_ne_last_zero
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; CHECK-NEXT: ret i1 true
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define i1 @nonexact_ashr_ne_last_zero(i8 %a) {
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%shr = ashr i8 -128, %a
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%cmp = icmp ne i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @lshr_eq_msb_low_last_zero
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; CHECK-NEXT: icmp ugt i8 %a, 6
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define i1 @lshr_eq_msb_low_last_zero(i8 %a) {
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%shr = lshr i8 127, %a
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%cmp = icmp eq i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @ashr_eq_msb_low_second_zero
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; CHECK-NEXT: icmp ugt i8 %a, 6
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define i1 @ashr_eq_msb_low_second_zero(i8 %a) {
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%shr = ashr i8 127, %a
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%cmp = icmp eq i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @lshr_ne_msb_low_last_zero
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; CHECK-NEXT: icmp ult i8 %a, 7
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define i1 @lshr_ne_msb_low_last_zero(i8 %a) {
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%shr = lshr i8 127, %a
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%cmp = icmp ne i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @ashr_ne_msb_low_second_zero
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; CHECK-NEXT: icmp ult i8 %a, 7
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define i1 @ashr_ne_msb_low_second_zero(i8 %a) {
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%shr = ashr i8 127, %a
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%cmp = icmp ne i8 %shr, 0
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ret i1 %cmp
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}
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; CHECK-LABEL: @lshr_eq_first_zero
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; CHECK-NEXT: ret i1 false
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define i1 @lshr_eq_first_zero(i8 %a) {
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%shr = lshr i8 0, %a
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%cmp = icmp eq i8 %shr, 2
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ret i1 %cmp
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}
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; CHECK-LABEL: @ashr_eq_first_zero
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; CHECK-NEXT: ret i1 false
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define i1 @ashr_eq_first_zero(i8 %a) {
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%shr = ashr i8 0, %a
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%cmp = icmp eq i8 %shr, 2
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ret i1 %cmp
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}
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; CHECK-LABEL: @lshr_ne_first_zero
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; CHECK-NEXT: ret i1 true
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define i1 @lshr_ne_first_zero(i8 %a) {
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%shr = lshr i8 0, %a
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%cmp = icmp ne i8 %shr, 2
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ret i1 %cmp
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}
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; CHECK-LABEL: @ashr_ne_first_zero
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; CHECK-NEXT: ret i1 true
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define i1 @ashr_ne_first_zero(i8 %a) {
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%shr = ashr i8 0, %a
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%cmp = icmp ne i8 %shr, 2
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ret i1 %cmp
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}
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; CHECK-LABEL: @ashr_eq_both_minus1
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; CHECK-NEXT: ret i1 true
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define i1 @ashr_eq_both_minus1(i8 %a) {
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%shr = ashr i8 -1, %a
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%cmp = icmp eq i8 %shr, -1
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ret i1 %cmp
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}
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; CHECK-LABEL: @ashr_ne_both_minus1
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; CHECK-NEXT: ret i1 false
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define i1 @ashr_ne_both_minus1(i8 %a) {
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%shr = ashr i8 -1, %a
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%cmp = icmp ne i8 %shr, -1
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_ashr_eq_both_minus1
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; CHECK-NEXT: ret i1 true
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define i1 @exact_ashr_eq_both_minus1(i8 %a) {
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%shr = ashr exact i8 -1, %a
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%cmp = icmp eq i8 %shr, -1
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_ashr_ne_both_minus1
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; CHECK-NEXT: ret i1 false
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define i1 @exact_ashr_ne_both_minus1(i8 %a) {
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%shr = ashr exact i8 -1, %a
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%cmp = icmp ne i8 %shr, -1
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ret i1 %cmp
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}
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; CHECK-LABEL: @ashr_eq_both_equal
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; CHECK-NEXT: icmp eq i8 %a, 0
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define i1 @ashr_eq_both_equal(i8 %a) {
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%shr = ashr i8 128, %a
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%cmp = icmp eq i8 %shr, 128
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ret i1 %cmp
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}
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; CHECK-LABEL: @ashr_ne_both_equal
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; CHECK-NEXT: icmp ne i8 %a, 0
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define i1 @ashr_ne_both_equal(i8 %a) {
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%shr = ashr i8 128, %a
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%cmp = icmp ne i8 %shr, 128
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ret i1 %cmp
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}
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; CHECK-LABEL: @lshr_eq_both_equal
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; CHECK-NEXT: icmp eq i8 %a, 0
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define i1 @lshr_eq_both_equal(i8 %a) {
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%shr = lshr i8 127, %a
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%cmp = icmp eq i8 %shr, 127
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ret i1 %cmp
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}
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; CHECK-LABEL: @lshr_ne_both_equal
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; CHECK-NEXT: icmp ne i8 %a, 0
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define i1 @lshr_ne_both_equal(i8 %a) {
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%shr = lshr i8 127, %a
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%cmp = icmp ne i8 %shr, 127
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_ashr_eq_both_equal
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; CHECK-NEXT: icmp eq i8 %a, 0
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define i1 @exact_ashr_eq_both_equal(i8 %a) {
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%shr = ashr exact i8 128, %a
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%cmp = icmp eq i8 %shr, 128
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_ashr_ne_both_equal
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; CHECK-NEXT: icmp ne i8 %a, 0
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define i1 @exact_ashr_ne_both_equal(i8 %a) {
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%shr = ashr exact i8 128, %a
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%cmp = icmp ne i8 %shr, 128
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_lshr_eq_both_equal
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; CHECK-NEXT: icmp eq i8 %a, 0
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define i1 @exact_lshr_eq_both_equal(i8 %a) {
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%shr = lshr exact i8 126, %a
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%cmp = icmp eq i8 %shr, 126
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_lshr_ne_both_equal
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; CHECK-NEXT: icmp ne i8 %a, 0
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define i1 @exact_lshr_ne_both_equal(i8 %a) {
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%shr = lshr exact i8 126, %a
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%cmp = icmp ne i8 %shr, 126
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_ashr_eq_opposite_msb
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; CHECK-NEXT: ret i1 false
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define i1 @exact_ashr_eq_opposite_msb(i8 %a) {
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%shr = ashr exact i8 -128, %a
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%cmp = icmp eq i8 %shr, 1
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ret i1 %cmp
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}
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; CHECK-LABEL: @ashr_eq_opposite_msb
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; CHECK-NEXT: ret i1 false
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define i1 @ashr_eq_opposite_msb(i8 %a) {
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%shr = ashr i8 -128, %a
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%cmp = icmp eq i8 %shr, 1
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_lshr_eq_opposite_msb
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; CHECK-NEXT: icmp eq i8 %a, 7
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define i1 @exact_lshr_eq_opposite_msb(i8 %a) {
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%shr = lshr exact i8 -128, %a
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%cmp = icmp eq i8 %shr, 1
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ret i1 %cmp
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}
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; CHECK-LABEL: @lshr_eq_opposite_msb
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; CHECK-NEXT: icmp eq i8 %a, 7
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define i1 @lshr_eq_opposite_msb(i8 %a) {
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%shr = lshr i8 -128, %a
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%cmp = icmp eq i8 %shr, 1
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_ashr_ne_opposite_msb
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; CHECK-NEXT: ret i1 true
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define i1 @exact_ashr_ne_opposite_msb(i8 %a) {
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%shr = ashr exact i8 -128, %a
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%cmp = icmp ne i8 %shr, 1
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ret i1 %cmp
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}
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; CHECK-LABEL: @ashr_ne_opposite_msb
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; CHECK-NEXT: ret i1 true
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define i1 @ashr_ne_opposite_msb(i8 %a) {
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%shr = ashr i8 -128, %a
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%cmp = icmp ne i8 %shr, 1
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_lshr_ne_opposite_msb
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; CHECK-NEXT: icmp ne i8 %a, 7
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define i1 @exact_lshr_ne_opposite_msb(i8 %a) {
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%shr = lshr exact i8 -128, %a
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%cmp = icmp ne i8 %shr, 1
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ret i1 %cmp
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}
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; CHECK-LABEL: @lshr_ne_opposite_msb
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; CHECK-NEXT: icmp ne i8 %a, 7
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define i1 @lshr_ne_opposite_msb(i8 %a) {
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%shr = lshr i8 -128, %a
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%cmp = icmp ne i8 %shr, 1
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_ashr_eq_shift_gt
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; CHECK-NEXT : ret i1 false
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define i1 @exact_ashr_eq_shift_gt(i8 %a) {
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%shr = ashr exact i8 -2, %a
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%cmp = icmp eq i8 %shr, -8
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_ashr_ne_shift_gt
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; CHECK-NEXT : ret i1 true
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define i1 @exact_ashr_ne_shift_gt(i8 %a) {
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%shr = ashr exact i8 -2, %a
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%cmp = icmp ne i8 %shr, -8
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ret i1 %cmp
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}
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; CHECK-LABEL: @nonexact_ashr_eq_shift_gt
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; CHECK-NEXT : ret i1 false
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define i1 @nonexact_ashr_eq_shift_gt(i8 %a) {
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%shr = ashr i8 -2, %a
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%cmp = icmp eq i8 %shr, -8
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ret i1 %cmp
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}
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; CHECK-LABEL: @nonexact_ashr_ne_shift_gt
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; CHECK-NEXT : ret i1 true
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define i1 @nonexact_ashr_ne_shift_gt(i8 %a) {
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%shr = ashr i8 -2, %a
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%cmp = icmp ne i8 %shr, -8
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_lshr_eq_shift_gt
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; CHECK-NEXT: ret i1 false
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define i1 @exact_lshr_eq_shift_gt(i8 %a) {
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%shr = lshr exact i8 2, %a
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%cmp = icmp eq i8 %shr, 8
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_lshr_ne_shift_gt
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; CHECK-NEXT: ret i1 true
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define i1 @exact_lshr_ne_shift_gt(i8 %a) {
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%shr = lshr exact i8 2, %a
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%cmp = icmp ne i8 %shr, 8
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ret i1 %cmp
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}
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; CHECK-LABEL: @nonexact_lshr_eq_shift_gt
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; CHECK-NEXT : ret i1 false
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define i1 @nonexact_lshr_eq_shift_gt(i8 %a) {
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%shr = lshr i8 2, %a
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%cmp = icmp eq i8 %shr, 8
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ret i1 %cmp
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}
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; CHECK-LABEL: @nonexact_lshr_ne_shift_gt
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; CHECK-NEXT : ret i1 true
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define i1 @nonexact_lshr_ne_shift_gt(i8 %a) {
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%shr = ashr i8 2, %a
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%cmp = icmp ne i8 %shr, 8
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_ashr_eq
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; CHECK-NEXT: icmp eq i8 %a, 7
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define i1 @exact_ashr_eq(i8 %a) {
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%shr = ashr exact i8 -128, %a
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%cmp = icmp eq i8 %shr, -1
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ret i1 %cmp
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}
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; CHECK-LABEL: @exact_ashr_ne
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; CHECK-NEXT: icmp ne i8 %a, 7
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define i1 @exact_ashr_ne(i8 %a) {
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%shr = ashr exact i8 -128, %a
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%cmp = icmp ne i8 %shr, -1
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ret i1 %cmp
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}
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|
; CHECK-LABEL: @exact_lshr_eq
|
|
; CHECK-NEXT: icmp eq i8 %a, 2
|
|
define i1 @exact_lshr_eq(i8 %a) {
|
|
%shr = lshr exact i8 4, %a
|
|
%cmp = icmp eq i8 %shr, 1
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @exact_lshr_ne
|
|
; CHECK-NEXT: icmp ne i8 %a, 2
|
|
define i1 @exact_lshr_ne(i8 %a) {
|
|
%shr = lshr exact i8 4, %a
|
|
%cmp = icmp ne i8 %shr, 1
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @nonexact_ashr_eq
|
|
; CHECK-NEXT: icmp eq i8 %a, 7
|
|
define i1 @nonexact_ashr_eq(i8 %a) {
|
|
%shr = ashr i8 -128, %a
|
|
%cmp = icmp eq i8 %shr, -1
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @nonexact_ashr_ne
|
|
; CHECK-NEXT: icmp ne i8 %a, 7
|
|
define i1 @nonexact_ashr_ne(i8 %a) {
|
|
%shr = ashr i8 -128, %a
|
|
%cmp = icmp ne i8 %shr, -1
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @nonexact_lshr_eq
|
|
; CHECK-NEXT: icmp eq i8 %a, 2
|
|
define i1 @nonexact_lshr_eq(i8 %a) {
|
|
%shr = lshr i8 4, %a
|
|
%cmp = icmp eq i8 %shr, 1
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @nonexact_lshr_ne
|
|
; CHECK-NEXT: icmp ne i8 %a, 2
|
|
define i1 @nonexact_lshr_ne(i8 %a) {
|
|
%shr = lshr i8 4, %a
|
|
%cmp = icmp ne i8 %shr, 1
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @exact_lshr_eq_exactdiv
|
|
; CHECK-NEXT: icmp eq i8 %a, 4
|
|
define i1 @exact_lshr_eq_exactdiv(i8 %a) {
|
|
%shr = lshr exact i8 80, %a
|
|
%cmp = icmp eq i8 %shr, 5
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @exact_lshr_ne_exactdiv
|
|
; CHECK-NEXT: icmp ne i8 %a, 4
|
|
define i1 @exact_lshr_ne_exactdiv(i8 %a) {
|
|
%shr = lshr exact i8 80, %a
|
|
%cmp = icmp ne i8 %shr, 5
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @nonexact_lshr_eq_exactdiv
|
|
; CHECK-NEXT: icmp eq i8 %a, 4
|
|
define i1 @nonexact_lshr_eq_exactdiv(i8 %a) {
|
|
%shr = lshr i8 80, %a
|
|
%cmp = icmp eq i8 %shr, 5
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @nonexact_lshr_ne_exactdiv
|
|
; CHECK-NEXT: icmp ne i8 %a, 4
|
|
define i1 @nonexact_lshr_ne_exactdiv(i8 %a) {
|
|
%shr = lshr i8 80, %a
|
|
%cmp = icmp ne i8 %shr, 5
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @exact_ashr_eq_exactdiv
|
|
; CHECK-NEXT: icmp eq i8 %a, 4
|
|
define i1 @exact_ashr_eq_exactdiv(i8 %a) {
|
|
%shr = ashr exact i8 -80, %a
|
|
%cmp = icmp eq i8 %shr, -5
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @exact_ashr_ne_exactdiv
|
|
; CHECK-NEXT: icmp ne i8 %a, 4
|
|
define i1 @exact_ashr_ne_exactdiv(i8 %a) {
|
|
%shr = ashr exact i8 -80, %a
|
|
%cmp = icmp ne i8 %shr, -5
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @nonexact_ashr_eq_exactdiv
|
|
; CHECK-NEXT: icmp eq i8 %a, 4
|
|
define i1 @nonexact_ashr_eq_exactdiv(i8 %a) {
|
|
%shr = ashr i8 -80, %a
|
|
%cmp = icmp eq i8 %shr, -5
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @nonexact_ashr_ne_exactdiv
|
|
; CHECK-NEXT: icmp ne i8 %a, 4
|
|
define i1 @nonexact_ashr_ne_exactdiv(i8 %a) {
|
|
%shr = ashr i8 -80, %a
|
|
%cmp = icmp ne i8 %shr, -5
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @exact_lshr_eq_noexactdiv
|
|
; CHECK-NEXT: ret i1 false
|
|
define i1 @exact_lshr_eq_noexactdiv(i8 %a) {
|
|
%shr = lshr exact i8 80, %a
|
|
%cmp = icmp eq i8 %shr, 31
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @exact_lshr_ne_noexactdiv
|
|
; CHECK-NEXT: ret i1 true
|
|
define i1 @exact_lshr_ne_noexactdiv(i8 %a) {
|
|
%shr = lshr exact i8 80, %a
|
|
%cmp = icmp ne i8 %shr, 31
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @nonexact_lshr_eq_noexactdiv
|
|
; CHECK-NEXT: ret i1 false
|
|
define i1 @nonexact_lshr_eq_noexactdiv(i8 %a) {
|
|
%shr = lshr i8 80, %a
|
|
%cmp = icmp eq i8 %shr, 31
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @nonexact_lshr_ne_noexactdiv
|
|
; CHECK-NEXT: ret i1 true
|
|
define i1 @nonexact_lshr_ne_noexactdiv(i8 %a) {
|
|
%shr = lshr i8 80, %a
|
|
%cmp = icmp ne i8 %shr, 31
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @exact_ashr_eq_noexactdiv
|
|
; CHECK-NEXT: ret i1 false
|
|
define i1 @exact_ashr_eq_noexactdiv(i8 %a) {
|
|
%shr = ashr exact i8 -80, %a
|
|
%cmp = icmp eq i8 %shr, -31
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @exact_ashr_ne_noexactdiv
|
|
; CHECK-NEXT: ret i1 true
|
|
define i1 @exact_ashr_ne_noexactdiv(i8 %a) {
|
|
%shr = ashr exact i8 -80, %a
|
|
%cmp = icmp ne i8 %shr, -31
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @nonexact_ashr_eq_noexactdiv
|
|
; CHECK-NEXT: ret i1 false
|
|
define i1 @nonexact_ashr_eq_noexactdiv(i8 %a) {
|
|
%shr = ashr i8 -80, %a
|
|
%cmp = icmp eq i8 %shr, -31
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @nonexact_ashr_ne_noexactdiv
|
|
; CHECK-NEXT: ret i1 true
|
|
define i1 @nonexact_ashr_ne_noexactdiv(i8 %a) {
|
|
%shr = ashr i8 -80, %a
|
|
%cmp = icmp ne i8 %shr, -31
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @exact_lshr_eq_noexactlog
|
|
; CHECK-NEXT: ret i1 false
|
|
define i1 @exact_lshr_eq_noexactlog(i8 %a) {
|
|
%shr = lshr exact i8 90, %a
|
|
%cmp = icmp eq i8 %shr, 30
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @exact_lshr_ne_noexactlog
|
|
; CHECK-NEXT: ret i1 true
|
|
define i1 @exact_lshr_ne_noexactlog(i8 %a) {
|
|
%shr = lshr exact i8 90, %a
|
|
%cmp = icmp ne i8 %shr, 30
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @nonexact_lshr_eq_noexactlog
|
|
; CHECK-NEXT: ret i1 false
|
|
define i1 @nonexact_lshr_eq_noexactlog(i8 %a) {
|
|
%shr = lshr i8 90, %a
|
|
%cmp = icmp eq i8 %shr, 30
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @nonexact_lshr_ne_noexactlog
|
|
; CHECK-NEXT: ret i1 true
|
|
define i1 @nonexact_lshr_ne_noexactlog(i8 %a) {
|
|
%shr = lshr i8 90, %a
|
|
%cmp = icmp ne i8 %shr, 30
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @exact_ashr_eq_noexactlog
|
|
; CHECK-NEXT: ret i1 false
|
|
define i1 @exact_ashr_eq_noexactlog(i8 %a) {
|
|
%shr = ashr exact i8 -90, %a
|
|
%cmp = icmp eq i8 %shr, -30
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @exact_ashr_ne_noexactlog
|
|
; CHECK-NEXT: ret i1 true
|
|
define i1 @exact_ashr_ne_noexactlog(i8 %a) {
|
|
%shr = ashr exact i8 -90, %a
|
|
%cmp = icmp ne i8 %shr, -30
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @nonexact_ashr_eq_noexactlog
|
|
; CHECK-NEXT: ret i1 false
|
|
define i1 @nonexact_ashr_eq_noexactlog(i8 %a) {
|
|
%shr = ashr i8 -90, %a
|
|
%cmp = icmp eq i8 %shr, -30
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; CHECK-LABEL: @nonexact_ashr_ne_noexactlog
|
|
; CHECK-NEXT: ret i1 true
|
|
define i1 @nonexact_ashr_ne_noexactlog(i8 %a) {
|
|
%shr = ashr i8 -90, %a
|
|
%cmp = icmp ne i8 %shr, -30
|
|
ret i1 %cmp
|
|
}
|
|
|
|
; Don't try to fold the entire body of function @PR20945 into a
|
|
; single `ret i1 true` statement.
|
|
; If %B is equal to 1, then this function would return false.
|
|
; As a consequence, the instruction combiner is not allowed to fold %cmp
|
|
; to 'true'. Instead, it should replace %cmp with a simpler comparison
|
|
; between %B and 1.
|
|
|
|
; CHECK-LABEL: @PR20945(
|
|
; CHECK: icmp ne i32 %B, 1
|
|
define i1 @PR20945(i32 %B) {
|
|
%shr = ashr i32 -9, %B
|
|
%cmp = icmp ne i32 %shr, -5
|
|
ret i1 %cmp
|
|
}
|