derek.holloway
7502bf64a4
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64 lines
2.5 KiB
LLVM
64 lines
2.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S < %s -passes=gvn | FileCheck %s
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; Analyze Load from clobbering memset.pattern.
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define i32 @memset_pattern_clobber_load(ptr %p) {
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; CHECK-LABEL: @memset_pattern_clobber_load(
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; CHECK-NEXT: call void @llvm.experimental.memset.pattern.p0.i8.i64(ptr [[P:%.*]], i8 1, i64 8, i1 false)
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; CHECK-NEXT: [[LOAD:%.*]] = load i32, ptr [[P]], align 4
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; CHECK-NEXT: ret i32 [[LOAD]]
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;
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call void @llvm.experimental.memset.pattern.p0.p0.i64(ptr %p, i8 1, i64 8, i1 false)
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%load = load i32, ptr %p
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ret i32 %load
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}
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define i32 @memset_pattern_clobber_load2(ptr %p) {
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; CHECK-LABEL: @memset_pattern_clobber_load2(
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; CHECK-NEXT: call void @llvm.experimental.memset.pattern.p0.i16.i64(ptr [[P:%.*]], i16 1, i64 8, i1 false)
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; CHECK-NEXT: [[LOAD:%.*]] = load i32, ptr [[P]], align 4
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; CHECK-NEXT: ret i32 [[LOAD]]
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;
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call void @llvm.experimental.memset.pattern(ptr %p, i16 1, i64 8, i1 false)
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%load = load i32, ptr %p
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ret i32 %load
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}
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define ptr @memset_pattern_clobber_load3(ptr %p) {
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; CHECK-LABEL: @memset_pattern_clobber_load3(
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; CHECK-NEXT: call void @llvm.experimental.memset.pattern.p0.p0.i64(ptr [[P:%.*]], ptr [[P]], i64 8, i1 false)
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; CHECK-NEXT: [[LOAD:%.*]] = load ptr, ptr [[P]], align 8
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; CHECK-NEXT: ret ptr [[LOAD]]
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;
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call void @llvm.experimental.memset.pattern(ptr %p, ptr %p, i64 8, i1 false)
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%load = load ptr, ptr %p
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ret ptr %load
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}
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define i32 @load_forward_over_memset_pattern(ptr %P, ptr noalias %Q) {
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; CHECK-LABEL: @load_forward_over_memset_pattern(
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; CHECK-NEXT: tail call void @llvm.experimental.memset.pattern.p0.i8.i64(ptr [[P:%.*]], i8 27, i64 8, i1 false)
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; CHECK-NEXT: ret i32 0
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;
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%v1 = load i32, ptr %Q
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tail call void @llvm.experimental.memset.pattern(ptr %P, i8 27, i64 8, i1 false)
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%v2 = load i32, ptr %Q
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%sub = sub i32 %v1, %v2
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ret i32 %sub
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}
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define i32 @load_forward_over_memset_pattern2(ptr %P, ptr noalias %Q) nounwind ssp {
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; CHECK-LABEL: @load_forward_over_memset_pattern2(
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; CHECK-NEXT: [[V1:%.*]] = load i32, ptr [[Q:%.*]], align 4
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; CHECK-NEXT: tail call void @llvm.experimental.memset.pattern.p0.p0.i64(ptr [[P:%.*]], ptr [[Q]], i64 8, i1 false)
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; CHECK-NEXT: [[V2:%.*]] = load i32, ptr [[Q]], align 4
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; CHECK-NEXT: [[SUB:%.*]] = sub i32 [[V1]], [[V2]]
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; CHECK-NEXT: ret i32 [[SUB]]
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;
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%v1 = load i32, ptr %Q
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tail call void @llvm.experimental.memset.pattern(ptr %P, ptr %Q, i64 8, i1 false)
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%v2 = load i32, ptr %Q
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%sub = sub i32 %v1, %v2
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ret i32 %sub
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}
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