2e26633af0
The behavior in Analysis (knownbits) implements poison semantics already, and we expect the transforms (for example, in instcombine) derived from those semantics, so this patch changes the LangRef and remaining code to be consistent. This is one more step in removing "undef" from LLVM. Without this, I think https://github.com/llvm/llvm-project/issues/53330 has a legitimate complaint because that report wants to allow subsequent code to mask off bits, and that is allowed with undef values. The clang builtins are not actually documented anywhere AFAICT, but we might want to add that to remove more uncertainty. Differential Revision: https://reviews.llvm.org/D117912
178 lines
4.2 KiB
LLVM
178 lines
4.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instsimplify -S | FileCheck %s
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declare i31 @llvm.ctpop.i31(i31 %val)
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declare i32 @llvm.cttz.i32(i32 %val, i1)
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declare i33 @llvm.ctlz.i33(i33 %val, i1)
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declare <2 x i31> @llvm.ctpop.v2i31(<2 x i31> %val)
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declare <2 x i32> @llvm.cttz.v2i32(<2 x i32> %val, i1)
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declare <2 x i33> @llvm.ctlz.v2i33(<2 x i33> %val, i1)
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define i31 @ctpop_const() {
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; CHECK-LABEL: @ctpop_const(
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; CHECK-NEXT: ret i31 12
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;
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%x = call i31 @llvm.ctpop.i31(i31 12415124)
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ret i31 %x
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}
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define i32 @cttz_const() {
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; CHECK-LABEL: @cttz_const(
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; CHECK-NEXT: ret i32 1
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;
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%x = call i32 @llvm.cttz.i32(i32 87359874, i1 true)
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ret i32 %x
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}
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define i33 @ctlz_const() {
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; CHECK-LABEL: @ctlz_const(
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; CHECK-NEXT: ret i33 6
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;
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%x = call i33 @llvm.ctlz.i33(i33 87359874, i1 true)
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ret i33 %x
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}
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define i31 @ctpop_zero() {
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; CHECK-LABEL: @ctpop_zero(
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; CHECK-NEXT: ret i31 0
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;
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%x = call i31 @llvm.ctpop.i31(i31 0)
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ret i31 %x
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}
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define i32 @cttz_zero_defined() {
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; CHECK-LABEL: @cttz_zero_defined(
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; CHECK-NEXT: ret i32 32
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;
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%x = call i32 @llvm.cttz.i32(i32 0, i1 false)
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ret i32 %x
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}
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define i32 @cttz_zero_is_poison() {
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; CHECK-LABEL: @cttz_zero_is_poison(
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; CHECK-NEXT: ret i32 poison
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;
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%x = call i32 @llvm.cttz.i32(i32 0, i1 true)
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ret i32 %x
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}
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define i33 @ctlz_zero_defined() {
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; CHECK-LABEL: @ctlz_zero_defined(
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; CHECK-NEXT: ret i33 33
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;
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%x = call i33 @llvm.ctlz.i33(i33 0, i1 false)
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ret i33 %x
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}
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define i33 @ctlz_zero_is_poison() {
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; CHECK-LABEL: @ctlz_zero_is_poison(
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; CHECK-NEXT: ret i33 poison
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;
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%x = call i33 @llvm.ctlz.i33(i33 0, i1 true)
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ret i33 %x
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}
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define i31 @ctpop_undef() {
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; CHECK-LABEL: @ctpop_undef(
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; CHECK-NEXT: ret i31 0
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;
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%x = call i31 @llvm.ctpop.i31(i31 undef)
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ret i31 %x
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}
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define i32 @cttz_undef_defined() {
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; CHECK-LABEL: @cttz_undef_defined(
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; CHECK-NEXT: ret i32 0
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;
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%x = call i32 @llvm.cttz.i32(i32 undef, i1 false)
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ret i32 %x
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}
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define i32 @cttz_undef_zero_is_poison() {
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; CHECK-LABEL: @cttz_undef_zero_is_poison(
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; CHECK-NEXT: ret i32 poison
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;
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%x = call i32 @llvm.cttz.i32(i32 undef, i1 true)
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ret i32 %x
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}
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define i33 @ctlz_undef_defined() {
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; CHECK-LABEL: @ctlz_undef_defined(
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; CHECK-NEXT: ret i33 0
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;
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%x = call i33 @llvm.ctlz.i33(i33 undef, i1 false)
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ret i33 %x
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}
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define i33 @ctlz_undef_zero_is_poison() {
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; CHECK-LABEL: @ctlz_undef_zero_is_poison(
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; CHECK-NEXT: ret i33 poison
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;
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%x = call i33 @llvm.ctlz.i33(i33 undef, i1 true)
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ret i33 %x
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}
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define <2 x i31> @ctpop_vector() {
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; CHECK-LABEL: @ctpop_vector(
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; CHECK-NEXT: ret <2 x i31> <i31 8, i31 1>
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;
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%x = call <2 x i31> @llvm.ctpop.v2i31(<2 x i31> <i31 255, i31 16>)
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ret <2 x i31> %x
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}
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define <2 x i31> @ctpop_vector_undef() {
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; CHECK-LABEL: @ctpop_vector_undef(
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; CHECK-NEXT: ret <2 x i31> zeroinitializer
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;
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%x = call <2 x i31> @llvm.ctpop.v2i31(<2 x i31> <i31 0, i31 undef>)
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ret <2 x i31> %x
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}
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define <2 x i32> @cttz_vector() {
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; CHECK-LABEL: @cttz_vector(
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; CHECK-NEXT: ret <2 x i32> <i32 0, i32 4>
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;
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%x = call <2 x i32> @llvm.cttz.v2i32(<2 x i32> <i32 255, i32 16>, i1 true)
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ret <2 x i32> %x
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}
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define <2 x i32> @cttz_vector_undef_defined() {
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; CHECK-LABEL: @cttz_vector_undef_defined(
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; CHECK-NEXT: ret <2 x i32> <i32 32, i32 0>
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;
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%x = call <2 x i32> @llvm.cttz.v2i32(<2 x i32> <i32 0, i32 undef>, i1 false)
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ret <2 x i32> %x
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}
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define <2 x i32> @cttz_vector_undef_zero_is_poison() {
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; CHECK-LABEL: @cttz_vector_undef_zero_is_poison(
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; CHECK-NEXT: ret <2 x i32> poison
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;
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%x = call <2 x i32> @llvm.cttz.v2i32(<2 x i32> <i32 0, i32 undef>, i1 true)
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ret <2 x i32> %x
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}
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define <2 x i33> @ctlz_vector() {
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; CHECK-LABEL: @ctlz_vector(
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; CHECK-NEXT: ret <2 x i33> <i33 25, i33 28>
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;
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%x = call <2 x i33> @llvm.ctlz.v2i33(<2 x i33> <i33 255, i33 16>, i1 true)
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ret <2 x i33> %x
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}
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define <2 x i33> @ctlz_vector_undef_defined() {
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; CHECK-LABEL: @ctlz_vector_undef_defined(
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; CHECK-NEXT: ret <2 x i33> <i33 33, i33 0>
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;
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%x = call <2 x i33> @llvm.ctlz.v2i33(<2 x i33> <i33 0, i33 undef>, i1 false)
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ret <2 x i33> %x
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}
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define <2 x i33> @ctlz_vector_undef_zero_is_poison() {
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; CHECK-LABEL: @ctlz_vector_undef_zero_is_poison(
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; CHECK-NEXT: ret <2 x i33> poison
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;
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%x = call <2 x i33> @llvm.ctlz.v2i33(<2 x i33> <i33 0, i33 undef>, i1 true)
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ret <2 x i33> %x
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}
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