derek.holloway
7502bf64a4
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172 lines
6.2 KiB
LLVM
172 lines
6.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -S -passes=instcombine < %s | FileCheck %s
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; sinf clobbering errno, but %p cannot alias errno per C/C++ strict aliasing rules via TBAA.
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; Can do constant store-to-load forwarding.
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define float @does_not_alias_errno(ptr %p, float %f) {
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; CHECK-LABEL: define float @does_not_alias_errno(
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; CHECK-SAME: ptr [[P:%.*]], float [[F:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: store float 0.000000e+00, ptr [[P]], align 4, !tbaa [[TBAA4:![0-9]+]]
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; CHECK-NEXT: [[CALL:%.*]] = call float @sinf(float [[F]])
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; CHECK-NEXT: ret float 0.000000e+00
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;
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entry:
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store float 0.000000e+00, ptr %p, align 4, !tbaa !4
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%call = call float @sinf(float %f)
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%0 = load float, ptr %p, align 4, !tbaa !4
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ret float %0
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}
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; sinf clobbering errno, but %p is alloca memory, wich can never aliases errno.
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; Can do constant store-to-load forwarding.
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define float @does_not_alias_errno_2(float %f) {
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; CHECK-LABEL: define float @does_not_alias_errno_2(
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; CHECK-SAME: float [[F:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: [[P:%.*]] = alloca float, align 4
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; CHECK-NEXT: call void @escape(ptr nonnull [[P]])
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; CHECK-NEXT: store float 0.000000e+00, ptr [[P]], align 4
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; CHECK-NEXT: [[TMP1:%.*]] = call float @sinf(float [[F]])
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; CHECK-NEXT: ret float 0.000000e+00
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;
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entry:
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%p = alloca float
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call void @escape(ptr %p)
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store float 0.0, ptr %p
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call float @sinf(float %f)
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%v = load float, ptr %p
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ret float %v
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}
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; sinf clobbering errno, but %p is memory accessed w/ size larger than errno.
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; Can do constant store-to-load forwarding.
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define double @does_not_alias_errno_3(ptr %p, float %f) {
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; CHECK-LABEL: define double @does_not_alias_errno_3(
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; CHECK-SAME: ptr [[P:%.*]], float [[F:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: call void @escape(ptr [[P]])
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; CHECK-NEXT: store double 0.000000e+00, ptr [[P]], align 8
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; CHECK-NEXT: [[TMP1:%.*]] = call float @sinf(float [[F]])
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; CHECK-NEXT: ret double 0.000000e+00
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;
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entry:
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call void @escape(ptr %p)
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store double 0.0, ptr %p
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call float @sinf(float %f)
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%v = load double, ptr %p
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ret double %v
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}
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; %p may alias errno, but read_errno does not clobber errno.
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; Can do constant store-to-load forwarding.
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define float @may_alias_errno_does_not_clobber(ptr %p, ptr byval(i8) %q) {
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; CHECK-LABEL: define float @may_alias_errno_does_not_clobber(
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; CHECK-SAME: ptr [[P:%.*]], ptr byval(i8) [[Q:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: store float 0.000000e+00, ptr [[P]], align 4
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; CHECK-NEXT: [[CALL:%.*]] = call float @read_errno(ptr nonnull [[Q]])
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; CHECK-NEXT: ret float 0.000000e+00
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;
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entry:
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store float 0.000000e+00, ptr %p, align 4
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%call = call float @read_errno(ptr %q)
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%0 = load float, ptr %p, align 4
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ret float %0
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}
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; sinf clobbering errno, unknown TBAA info, %p may alias errno.
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; Cannot do constant store-to-load forwarding.
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define float @may_alias_errno(ptr %p, float %f) {
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; CHECK-LABEL: define float @may_alias_errno(
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; CHECK-SAME: ptr [[P:%.*]], float [[F:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: store float 0.000000e+00, ptr [[P]], align 4
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; CHECK-NEXT: [[CALL:%.*]] = call float @sinf(float [[F]])
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; CHECK-NEXT: [[TMP0:%.*]] = load float, ptr [[P]], align 4
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; CHECK-NEXT: ret float [[TMP0]]
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;
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entry:
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store float 0.000000e+00, ptr %p, align 4
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%call = call float @sinf(float %f)
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%0 = load float, ptr %p, align 4
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ret float %0
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}
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; sinf clobbering errno, %p, a integer pointer, may alias errno.
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; Cannot do constant store-to-load forwarding.
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define i32 @may_alias_errno_2(ptr %p, float %f) {
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; CHECK-LABEL: define i32 @may_alias_errno_2(
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; CHECK-SAME: ptr [[P:%.*]], float [[F:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: store i32 0, ptr [[P]], align 4, !tbaa [[TBAA0:![0-9]+]]
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; CHECK-NEXT: [[CALL:%.*]] = call float @sinf(float [[F]])
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; CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[P]], align 4, !tbaa [[TBAA0]]
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; CHECK-NEXT: ret i32 [[TMP0]]
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;
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entry:
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store i32 0, ptr %p, align 4, !tbaa !0
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%call = call float @sinf(float %f)
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%0 = load i32, ptr %p, align 4, !tbaa !0
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ret i32 %0
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}
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; sinf clobbering errno, but %p is memory accessed w/ vector size larger than errno.
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; Can do constant store-to-load forwarding.
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define <4 x i32> @does_not_alias_errno_vec(ptr %p, float %f) {
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; CHECK-LABEL: define <4 x i32> @does_not_alias_errno_vec(
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; CHECK-SAME: ptr [[P:%.*]], float [[F:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: call void @escape(ptr [[P]])
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; CHECK-NEXT: store <4 x i32> zeroinitializer, ptr [[P]], align 16
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; CHECK-NEXT: [[TMP0:%.*]] = call float @sinf(float [[F]])
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; CHECK-NEXT: ret <4 x i32> zeroinitializer
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;
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entry:
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call void @escape(ptr %p)
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store <4 x i32> zeroinitializer, ptr %p
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call float @sinf(float %f)
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%v = load <4 x i32>, ptr %p
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ret <4 x i32> %v
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}
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; sinf clobbering errno, but %p is memory accessed w/ scalable vector size larger than errno.
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; Can do constant store-to-load forwarding.
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define <vscale x 4 x i32> @does_not_alias_errno_scalablevec(ptr %p, float %f) {
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; CHECK-LABEL: define <vscale x 4 x i32> @does_not_alias_errno_scalablevec(
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; CHECK-SAME: ptr [[P:%.*]], float [[F:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: call void @escape(ptr [[P]])
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; CHECK-NEXT: store <vscale x 4 x i32> zeroinitializer, ptr [[P]], align 16
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; CHECK-NEXT: [[TMP0:%.*]] = call float @sinf(float [[F]])
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; CHECK-NEXT: ret <vscale x 4 x i32> zeroinitializer
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;
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entry:
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call void @escape(ptr %p)
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store <vscale x 4 x i32> zeroinitializer, ptr %p
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call float @sinf(float %f)
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%v = load <vscale x 4 x i32>, ptr %p
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ret <vscale x 4 x i32> %v
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}
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declare float @sinf(float) memory(errnomem: write)
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declare float @read_errno(ptr) memory(argmem: write, errnomem: read)
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declare void @escape(ptr %p)
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!llvm.errno.tbaa = !{!0}
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!0 = !{!1, !1, i64 0}
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!1 = !{!"int", !2, i64 0}
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!2 = !{!"omnipotent char", !3, i64 0}
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!3 = !{!"Simple C/C++ TBAA"}
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!4 = !{!5, !5, i64 0}
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!5 = !{!"float", !2, i64 0}
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;.
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; CHECK: [[TBAA0]] = !{[[META1:![0-9]+]], [[META1]], i64 0}
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; CHECK: [[META1]] = !{!"int", [[META2:![0-9]+]], i64 0}
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; CHECK: [[META2]] = !{!"omnipotent char", [[META3:![0-9]+]], i64 0}
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; CHECK: [[META3]] = !{!"Simple C/C++ TBAA"}
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; CHECK: [[TBAA4]] = !{[[META5:![0-9]+]], [[META5]], i64 0}
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; CHECK: [[META5]] = !{!"float", [[META2]], i64 0}
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;.
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