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6655b5e078
Summary: A number of optimizations are inhibited by single-use TokenFactors not being merged into the TokenFactor using it. This makes we consider if we can do the merge immediately. Most tests changes here are due to the change in visitation causing minor reorderings and associated reassociation of paired memory operations. CodeGen tests with non-reordering changes: X86/aligned-variadic.ll -- memory-based add folded into stored leaq value. X86/constant-combiners.ll -- Optimizes out overlap between stores. X86/pr40631_deadstore_elision -- folds constant byte store into preceding quad word constant store. Reviewers: RKSimon, craig.topper, spatel, efriedma, courbet Reviewed By: courbet Subscribers: dylanmckay, sdardis, nemanjai, jvesely, nhaehnle, javed.absar, eraman, hiraditya, kbarton, jrtc27, atanasyan, jsji, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D59260 llvm-svn: 356068
52 lines
1.3 KiB
LLVM
52 lines
1.3 KiB
LLVM
; RUN: llc < %s -frame-pointer=all -mtriple=arm64-windows | FileCheck %s
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; Test generated from C code:
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; #include <stdarg.h>
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; void *foo() {
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; return _AddressOfReturnAddress();
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; }
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; int bar(int x(va_list, void*), ...) {
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; va_list y;
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; va_start(y, x);
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; return x(y, _AddressOfReturnAddress()) + 1;
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; }
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declare void @llvm.va_start(i8*)
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declare i8* @llvm.addressofreturnaddress()
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define dso_local i8* @"foo"() {
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entry:
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%0 = call i8* @llvm.addressofreturnaddress()
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ret i8* %0
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; CHECK-LABEL: foo
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; CHECK: stp x29, x30, [sp, #-16]!
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; CHECK: mov x29, sp
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; CHECK: add x0, x29, #8
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; CHECK: ldp x29, x30, [sp], #16
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}
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define dso_local i32 @"bar"(i32 (i8*, i8*)* %x, ...) {
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entry:
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%x.addr = alloca i32 (i8*, i8*)*, align 8
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%y = alloca i8*, align 8
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store i32 (i8*, i8*)* %x, i32 (i8*, i8*)** %x.addr, align 8
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%y1 = bitcast i8** %y to i8*
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call void @llvm.va_start(i8* %y1)
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%0 = load i32 (i8*, i8*)*, i32 (i8*, i8*)** %x.addr, align 8
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%1 = call i8* @llvm.addressofreturnaddress()
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%2 = load i8*, i8** %y, align 8
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%call = call i32 %0(i8* %2, i8* %1)
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%add = add nsw i32 %call, 1
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ret i32 %add
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; CHECK-LABEL: bar
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; CHECK: sub sp, sp, #96
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; CHECK: stp x29, x30, [sp, #16]
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; CHECK: add x29, sp, #16
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; CHECK: stp x1, x2, [x29, #24]
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; CHECK: add x1, x29, #8
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; CHECK: ldp x29, x30, [sp, #16]
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; CHECK: add sp, sp, #96
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}
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