llvm-mirror/test/Transforms/InstSimplify/vec-cmp.ll
Sanjay Patel d1d88e8e3a [ValueTracking, InstSimplify] extend isKnownNonZero() to handle vector constants
Similar in spirit to D20497 :
If all elements of a constant vector are known non-zero, then we can say that the
whole vector is known non-zero.

It seems like we could extend this to FP scalar/vector too, but isKnownNonZero()
says it only works for integers and pointers for now.

Differential Revision: http://reviews.llvm.org/D20544

llvm-svn: 270562
2016-05-24 14:18:49 +00:00

66 lines
2.0 KiB
LLVM

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instsimplify -S | FileCheck %s
define <2 x i1> @nonzero_vec_splat(<2 x i32> %x) {
; CHECK-LABEL: @nonzero_vec_splat(
; CHECK-NEXT: ret <2 x i1> zeroinitializer
;
%y = or <2 x i32> %x, <i32 1, i32 1>
%c = icmp eq <2 x i32> %y, zeroinitializer
ret <2 x i1> %c
}
define <2 x i1> @nonzero_vec_nonsplat(<2 x i32> %x) {
; CHECK-LABEL: @nonzero_vec_nonsplat(
; CHECK-NEXT: ret <2 x i1> <i1 true, i1 true>
;
%y = or <2 x i32> %x, <i32 2, i32 1>
%c = icmp ne <2 x i32> %y, zeroinitializer
ret <2 x i1> %c
}
define <2 x i1> @nonzero_vec_undef_elt(<2 x i32> %x) {
; CHECK-LABEL: @nonzero_vec_undef_elt(
; CHECK-NEXT: ret <2 x i1> zeroinitializer
;
%y = or <2 x i32> %x, <i32 undef, i32 1>
%c = icmp eq <2 x i32> %y, zeroinitializer
ret <2 x i1> %c
}
define <2 x i1> @may_be_zero_vec(<2 x i32> %x) {
; CHECK-LABEL: @may_be_zero_vec(
; CHECK-NEXT: [[Y:%.*]] = or <2 x i32> %x, <i32 0, i32 1>
; CHECK-NEXT: [[C:%.*]] = icmp ne <2 x i32> [[Y]], zeroinitializer
; CHECK-NEXT: ret <2 x i1> [[C]]
;
%y = or <2 x i32> %x, <i32 0, i32 1>
%c = icmp ne <2 x i32> %y, zeroinitializer
ret <2 x i1> %c
}
; Multiplies of non-zero numbers are non-zero if there is no unsigned overflow.
define <2 x i1> @nonzero_vec_mul_nuw(<2 x i32> %x, <2 x i32> %y) {
; CHECK-LABEL: @nonzero_vec_mul_nuw(
; CHECK-NEXT: ret <2 x i1> zeroinitializer
;
%xnz = or <2 x i32> %x, <i32 1, i32 2>
%ynz = or <2 x i32> %y, <i32 3, i32 undef>
%m = mul nuw <2 x i32> %xnz, %ynz
%c = icmp eq <2 x i32> %m, zeroinitializer
ret <2 x i1> %c
}
; Multiplies of non-zero numbers are non-zero if there is no signed overflow.
define <2 x i1> @nonzero_vec_mul_nsw(<2 x i32> %x, <2 x i32> %y) {
; CHECK-LABEL: @nonzero_vec_mul_nsw(
; CHECK-NEXT: ret <2 x i1> <i1 true, i1 true>
;
%xnz = or <2 x i32> %x, <i32 undef, i32 2>
%ynz = or <2 x i32> %y, <i32 3, i32 4>
%m = mul nsw <2 x i32> %xnz, %ynz
%c = icmp ne <2 x i32> %m, zeroinitializer
ret <2 x i1> %c
}