cd6f40f432
This adds an -enable-memcpyopt-memoryssa option that currently does nothing apart from requiring MSSA as a dependency. The tests are split to run both with the option disabled and enabled. I went with this rather than the separate directory DSE uses, as I found it convenient to have a direct side-by-side comparison of differences. Differential Revision: https://reviews.llvm.org/D89206
53 lines
2.3 KiB
LLVM
53 lines
2.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -S -basic-aa -memcpyopt -enable-memcpyopt-memoryssa=0 | FileCheck %s --check-prefixes=CHECK,NO_MSSA
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; RUN: opt < %s -S -basic-aa -memcpyopt -enable-memcpyopt-memoryssa=1 -verify-memoryssa | FileCheck %s --check-prefixes=CHECK,MSSA
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target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64"
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind
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declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i1) nounwind
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; The resulting memset is only 4-byte aligned, despite containing
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; a 16-byte aligned store in the middle.
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define void @foo(i32* %p) {
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; CHECK-LABEL: @foo(
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; CHECK-NEXT: [[A0:%.*]] = getelementptr i32, i32* [[P:%.*]], i64 0
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; CHECK-NEXT: [[A1:%.*]] = getelementptr i32, i32* [[P]], i64 1
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; CHECK-NEXT: [[A2:%.*]] = getelementptr i32, i32* [[P]], i64 2
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; CHECK-NEXT: [[A3:%.*]] = getelementptr i32, i32* [[P]], i64 3
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; CHECK-NEXT: [[TMP1:%.*]] = bitcast i32* [[A0]] to i8*
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 4 [[TMP1]], i8 0, i64 16, i1 false)
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; CHECK-NEXT: ret void
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;
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%a0 = getelementptr i32, i32* %p, i64 0
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store i32 0, i32* %a0, align 4
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%a1 = getelementptr i32, i32* %p, i64 1
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store i32 0, i32* %a1, align 16
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%a2 = getelementptr i32, i32* %p, i64 2
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store i32 0, i32* %a2, align 4
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%a3 = getelementptr i32, i32* %p, i64 3
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store i32 0, i32* %a3, align 4
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ret void
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}
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; Replacing %a8 with %a4 in the memset requires boosting the alignment of %a4.
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define void @bar() {
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; CHECK-LABEL: @bar(
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; CHECK-NEXT: [[A4:%.*]] = alloca i32, align 8
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; CHECK-NEXT: [[A8:%.*]] = alloca i32, align 8
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; CHECK-NEXT: [[A8_CAST:%.*]] = bitcast i32* [[A8]] to i8*
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; CHECK-NEXT: [[A4_CAST:%.*]] = bitcast i32* [[A4]] to i8*
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; CHECK-NEXT: [[A41:%.*]] = bitcast i32* [[A4]] to i8*
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 8 [[A41]], i8 0, i64 4, i1 false)
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; CHECK-NEXT: ret void
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;
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%a4 = alloca i32, align 4
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%a8 = alloca i32, align 8
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%a8.cast = bitcast i32* %a8 to i8*
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%a4.cast = bitcast i32* %a4 to i8*
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call void @llvm.memset.p0i8.i64(i8* align 8 %a8.cast, i8 0, i64 4, i1 false)
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 %a4.cast, i8* align 4 %a8.cast, i64 4, i1 false)
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ret void
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}
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