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llvm/test/Transforms/InstCombine/2004-11-27-SetCCForCastLargerAndConstant.ll
Sanjay Patel b17db4cf26 [InstCombine] limit icmp transform to ConstantInt (PR28011) 
In r271810 ( http://reviews.llvm.org/rL271810 ), I loosened the check
above this to work for any Constant rather than ConstantInt. AFAICT, 
that part makes sense if we can determine that the shrunken/extended 
constant remained equal. But it doesn't make sense for this later 
transform where we assume that the constant DID change. 

This could assert for a ConstantExpr:
https://llvm.org/bugs/show_bug.cgi?id=28011

And it could be wrong for a vector as shown in the added regression test.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@271908 91177308-0d34-0410-b5e6-96231b3b80d8
2016-06-06 16:56:57 +00:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; This test case tests the InstructionCombining optimization that
; reduces things like:
; %Y = sext i8 %X to i32
; %C = icmp ult i32 %Y, 1024
; to
; %C = i1 true
; It includes test cases for different constant values, signedness of the
; cast operands, and types of setCC operators. In all cases, the cast should
; be eliminated. In many cases the setCC is also eliminated based on the
; constant value and the range of the casted value.
;
; RUN: opt < %s -instcombine -S | FileCheck %s
define i1 @lt_signed_to_large_unsigned(i8 %SB) {
; CHECK-LABEL: @lt_signed_to_large_unsigned(
; CHECK-NEXT: [[C1:%.*]] = icmp sgt i8 %SB, -1
; CHECK-NEXT: ret i1 [[C1]]
;
%Y = sext i8 %SB to i32
%C = icmp ult i32 %Y, 1024
ret i1 %C
}
; PR28011 - https://llvm.org/bugs/show_bug.cgi?id=28011
; The above transform only applies to scalar integers; it shouldn't be attempted for constant expressions or vectors.
@a = common global i32** null
@b = common global [1 x i32] zeroinitializer
define i1 @PR28011(i16 %a) {
; CHECK-LABEL: @PR28011(
; CHECK-NEXT: [[CONV:%.*]] = sext i16 %a to i32
; CHECK-NEXT: [[CMP:%.*]] = icmp ne i32 [[CONV]], or (i32 zext (i1 icmp ne (i32*** bitcast ([1 x i32]* @b to i32***), i32*** @a) to i32), i32 1)
; CHECK-NEXT: ret i1 [[CMP]]
;
%conv = sext i16 %a to i32
%cmp = icmp ne i32 %conv, or (i32 zext (i1 icmp ne (i32*** bitcast ([1 x i32]* @b to i32***), i32*** @a) to i32), i32 1)
ret i1 %cmp
}
define <2 x i1> @lt_signed_to_large_unsigned_vec(<2 x i8> %SB) {
; CHECK-LABEL: @lt_signed_to_large_unsigned_vec(
; CHECK-NEXT: [[Y:%.*]] = sext <2 x i8> %SB to <2 x i32>
; CHECK-NEXT: [[C:%.*]] = icmp ult <2 x i32> [[Y]], <i32 1024, i32 2>
; CHECK-NEXT: ret <2 x i1> [[C]]
;
%Y = sext <2 x i8> %SB to <2 x i32>
%C = icmp ult <2 x i32> %Y, <i32 1024, i32 2>
ret <2 x i1> %C
}
define i1 @lt_signed_to_large_signed(i8 %SB) {
; CHECK-LABEL: @lt_signed_to_large_signed(
; CHECK-NEXT: ret i1 true
;
%Y = sext i8 %SB to i32
%C = icmp slt i32 %Y, 1024
ret i1 %C
}
define i1 @lt_signed_to_large_negative(i8 %SB) {
; CHECK-LABEL: @lt_signed_to_large_negative(
; CHECK-NEXT: ret i1 false
;
%Y = sext i8 %SB to i32
%C = icmp slt i32 %Y, -1024
ret i1 %C
}
define i1 @lt_signed_to_small_unsigned(i8 %SB) {
; CHECK-LABEL: @lt_signed_to_small_unsigned(
; CHECK-NEXT: [[C:%.*]] = icmp ult i8 %SB, 17
; CHECK-NEXT: ret i1 [[C]]
;
%Y = sext i8 %SB to i32
%C = icmp ult i32 %Y, 17
ret i1 %C
}
define i1 @lt_signed_to_small_signed(i8 %SB) {
; CHECK-LABEL: @lt_signed_to_small_signed(
; CHECK-NEXT: [[C:%.*]] = icmp slt i8 %SB, 17
; CHECK-NEXT: ret i1 [[C]]
;
%Y = sext i8 %SB to i32
%C = icmp slt i32 %Y, 17
ret i1 %C
}
define i1 @lt_signed_to_small_negative(i8 %SB) {
; CHECK-LABEL: @lt_signed_to_small_negative(
; CHECK-NEXT: [[C:%.*]] = icmp slt i8 %SB, -17
; CHECK-NEXT: ret i1 [[C]]
;
%Y = sext i8 %SB to i32
%C = icmp slt i32 %Y, -17
ret i1 %C
}
define i1 @lt_unsigned_to_large_unsigned(i8 %SB) {
; CHECK-LABEL: @lt_unsigned_to_large_unsigned(
; CHECK-NEXT: ret i1 true
;
%Y = zext i8 %SB to i32
%C = icmp ult i32 %Y, 1024
ret i1 %C
}
define i1 @lt_unsigned_to_large_signed(i8 %SB) {
; CHECK-LABEL: @lt_unsigned_to_large_signed(
; CHECK-NEXT: ret i1 true
;
%Y = zext i8 %SB to i32
%C = icmp slt i32 %Y, 1024
ret i1 %C
}
define i1 @lt_unsigned_to_large_negative(i8 %SB) {
; CHECK-LABEL: @lt_unsigned_to_large_negative(
; CHECK-NEXT: ret i1 false
;
%Y = zext i8 %SB to i32
%C = icmp slt i32 %Y, -1024
ret i1 %C
}
define i1 @lt_unsigned_to_small_unsigned(i8 %SB) {
; CHECK-LABEL: @lt_unsigned_to_small_unsigned(
; CHECK-NEXT: [[C:%.*]] = icmp ult i8 %SB, 17
; CHECK-NEXT: ret i1 [[C]]
;
%Y = zext i8 %SB to i32
%C = icmp ult i32 %Y, 17
ret i1 %C
}
define i1 @lt_unsigned_to_small_signed(i8 %SB) {
; CHECK-LABEL: @lt_unsigned_to_small_signed(
; CHECK-NEXT: [[C:%.*]] = icmp ult i8 %SB, 17
; CHECK-NEXT: ret i1 [[C]]
;
%Y = zext i8 %SB to i32
%C = icmp slt i32 %Y, 17
ret i1 %C
}
define i1 @lt_unsigned_to_small_negative(i8 %SB) {
; CHECK-LABEL: @lt_unsigned_to_small_negative(
; CHECK-NEXT: ret i1 false
;
%Y = zext i8 %SB to i32
%C = icmp slt i32 %Y, -17
ret i1 %C
}
define i1 @gt_signed_to_large_unsigned(i8 %SB) {
; CHECK-LABEL: @gt_signed_to_large_unsigned(
; CHECK-NEXT: [[C:%.*]] = icmp slt i8 %SB, 0
; CHECK-NEXT: ret i1 [[C]]
;
%Y = sext i8 %SB to i32
%C = icmp ugt i32 %Y, 1024
ret i1 %C
}
define i1 @gt_signed_to_large_signed(i8 %SB) {
; CHECK-LABEL: @gt_signed_to_large_signed(
; CHECK-NEXT: ret i1 false
;
%Y = sext i8 %SB to i32
%C = icmp sgt i32 %Y, 1024
ret i1 %C
}
define i1 @gt_signed_to_large_negative(i8 %SB) {
; CHECK-LABEL: @gt_signed_to_large_negative(
; CHECK-NEXT: ret i1 true
;
%Y = sext i8 %SB to i32
%C = icmp sgt i32 %Y, -1024
ret i1 %C
}
define i1 @gt_signed_to_small_unsigned(i8 %SB) {
; CHECK-LABEL: @gt_signed_to_small_unsigned(
; CHECK-NEXT: [[C:%.*]] = icmp ugt i8 %SB, 17
; CHECK-NEXT: ret i1 [[C]]
;
%Y = sext i8 %SB to i32
%C = icmp ugt i32 %Y, 17
ret i1 %C
}
define i1 @gt_signed_to_small_signed(i8 %SB) {
; CHECK-LABEL: @gt_signed_to_small_signed(
; CHECK-NEXT: [[C:%.*]] = icmp sgt i8 %SB, 17
; CHECK-NEXT: ret i1 [[C]]
;
%Y = sext i8 %SB to i32
%C = icmp sgt i32 %Y, 17
ret i1 %C
}
define i1 @gt_signed_to_small_negative(i8 %SB) {
; CHECK-LABEL: @gt_signed_to_small_negative(
; CHECK-NEXT: [[C:%.*]] = icmp sgt i8 %SB, -17
; CHECK-NEXT: ret i1 [[C]]
;
%Y = sext i8 %SB to i32
%C = icmp sgt i32 %Y, -17
ret i1 %C
}
define i1 @gt_unsigned_to_large_unsigned(i8 %SB) {
; CHECK-LABEL: @gt_unsigned_to_large_unsigned(
; CHECK-NEXT: ret i1 false
;
%Y = zext i8 %SB to i32
%C = icmp ugt i32 %Y, 1024
ret i1 %C
}
define i1 @gt_unsigned_to_large_signed(i8 %SB) {
; CHECK-LABEL: @gt_unsigned_to_large_signed(
; CHECK-NEXT: ret i1 false
;
%Y = zext i8 %SB to i32
%C = icmp sgt i32 %Y, 1024
ret i1 %C
}
define i1 @gt_unsigned_to_large_negative(i8 %SB) {
; CHECK-LABEL: @gt_unsigned_to_large_negative(
; CHECK-NEXT: ret i1 true
;
%Y = zext i8 %SB to i32
%C = icmp sgt i32 %Y, -1024
ret i1 %C
}
define i1 @gt_unsigned_to_small_unsigned(i8 %SB) {
; CHECK-LABEL: @gt_unsigned_to_small_unsigned(
; CHECK-NEXT: [[C:%.*]] = icmp ugt i8 %SB, 17
; CHECK-NEXT: ret i1 [[C]]
;
%Y = zext i8 %SB to i32
%C = icmp ugt i32 %Y, 17
ret i1 %C
}
define i1 @gt_unsigned_to_small_signed(i8 %SB) {
; CHECK-LABEL: @gt_unsigned_to_small_signed(
; CHECK-NEXT: [[C:%.*]] = icmp ugt i8 %SB, 17
; CHECK-NEXT: ret i1 [[C]]
;
%Y = zext i8 %SB to i32
%C = icmp sgt i32 %Y, 17
ret i1 %C
}
define i1 @gt_unsigned_to_small_negative(i8 %SB) {
; CHECK-LABEL: @gt_unsigned_to_small_negative(
; CHECK-NEXT: ret i1 true
;
%Y = zext i8 %SB to i32
%C = icmp sgt i32 %Y, -17
ret i1 %C
}
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