43 lines
1.3 KiB
LLVM
43 lines
1.3 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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; Make sure we check that forwarded memory arguments are not modified when tail
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; calling. inalloca and copy arg elimination make argument slots mutable.
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target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
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target triple = "i386-pc-windows-msvc19.0.24215"
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declare x86_stdcallcc void @tail_std(i32)
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declare void @capture(i32*)
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define x86_thiscallcc void @inalloca(i32* %this, i32* inalloca %args) {
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entry:
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%val = load i32, i32* %args
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store i32 0, i32* %args
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tail call x86_stdcallcc void @tail_std(i32 %val)
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ret void
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}
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; CHECK-LABEL: _inalloca: # @inalloca
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; CHECK: movl 4(%esp), %[[reg:[^ ]*]]
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; CHECK: movl $0, 4(%esp)
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; CHECK: pushl %[[reg]]
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; CHECK: calll _tail_std@4
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; CHECK: retl $4
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define x86_stdcallcc void @copy_elide(i32 %arg) {
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entry:
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%arg.ptr = alloca i32
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store i32 %arg, i32* %arg.ptr
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call void @capture(i32* %arg.ptr)
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tail call x86_stdcallcc void @tail_std(i32 %arg)
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ret void
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}
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; CHECK-LABEL: _copy_elide@4: # @copy_elide
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; CHECK: leal {{[0-9]+}}(%esp), %[[reg:[^ ]*]]
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; CHECK: pushl %[[reg]]
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; CHECK: calll _capture
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; ...
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; CHECK: calll _tail_std@4
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; CHECK: retl $4
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