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https://github.com/c64scene-ar/llvm-6502.git
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7a1b190bcd
This helps reduce the frequency of stack realignment prologues in 32-bit X86 Windows code. Before this change and the corresponding clang change, we would take the max of the type preferred alignment and the explicit alignment on the alloca. If you don't override aggregate alignment in datalayout, you get a default of 8. This dates back to 2007 / r34356, and changing it seems prohibitively difficult at this point. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236270 91177308-0d34-0410-b5e6-96231b3b80d8
63 lines
1.6 KiB
LLVM
63 lines
1.6 KiB
LLVM
; RUN: llc < %s -mtriple=i686-pc-win32 | FileCheck %s
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%Foo = type { i32, i32 }
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declare void @f(%Foo* inalloca %b)
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define void @a() {
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; CHECK-LABEL: _a:
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entry:
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%b = alloca inalloca %Foo
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; CHECK: movl $8, %eax
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; CHECK: calll __chkstk
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%f1 = getelementptr %Foo, %Foo* %b, i32 0, i32 0
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%f2 = getelementptr %Foo, %Foo* %b, i32 0, i32 1
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store i32 13, i32* %f1
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store i32 42, i32* %f2
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; CHECK: movl $13, (%esp)
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; CHECK: movl $42, 4(%esp)
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call void @f(%Foo* inalloca %b)
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; CHECK: calll _f
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ret void
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}
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declare void @inreg_with_inalloca(i32 inreg %a, %Foo* inalloca %b)
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define void @b() {
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; CHECK-LABEL: _b:
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entry:
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%b = alloca inalloca %Foo
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; CHECK: movl $8, %eax
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; CHECK: calll __chkstk
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%f1 = getelementptr %Foo, %Foo* %b, i32 0, i32 0
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%f2 = getelementptr %Foo, %Foo* %b, i32 0, i32 1
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store i32 13, i32* %f1
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store i32 42, i32* %f2
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; CHECK: movl $13, (%esp)
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; CHECK: movl $42, 4(%esp)
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call void @inreg_with_inalloca(i32 inreg 1, %Foo* inalloca %b)
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; CHECK: movl $1, %eax
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; CHECK: calll _inreg_with_inalloca
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ret void
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}
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declare x86_thiscallcc void @thiscall_with_inalloca(i8* %a, %Foo* inalloca %b)
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define void @c() {
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; CHECK-LABEL: _c:
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entry:
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%b = alloca inalloca %Foo
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; CHECK: movl $8, %eax
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; CHECK: calll __chkstk
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%f1 = getelementptr %Foo, %Foo* %b, i32 0, i32 0
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%f2 = getelementptr %Foo, %Foo* %b, i32 0, i32 1
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store i32 13, i32* %f1
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store i32 42, i32* %f2
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; CHECK-DAG: movl $13, (%esp)
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; CHECK-DAG: movl $42, 4(%esp)
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call x86_thiscallcc void @thiscall_with_inalloca(i8* null, %Foo* inalloca %b)
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; CHECK-DAG: xorl %ecx, %ecx
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; CHECK: calll _thiscall_with_inalloca
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ret void
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}
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