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