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| author | David Majnemer <david.majnemer@gmail.com> | 2016-03-01 19:20:23 +0000 |
|---|---|---|
| committer | David Majnemer <david.majnemer@gmail.com> | 2016-03-01 19:20:23 +0000 |
| commit | 791b88b6da79b9d296fd31f20529efb20d23af63 (patch) | |
| tree | a8be75f286397cb104f80659c7c9e9f6822a804d /llvm/test/CodeGen/X86/inalloca-stdcall.ll | |
| parent | 2abc587c1ef126850cd230e44deca6e93fab0b9b (diff) | |
| download | bcm5719-llvm-791b88b6da79b9d296fd31f20529efb20d23af63.tar.gz bcm5719-llvm-791b88b6da79b9d296fd31f20529efb20d23af63.zip | |
[X86] Elide references to _chkstk for dynamic allocas
The _chkstk function is called by the compiler to probe the stack in an
order consistent with Windows' expectations. However, it is possible to
elide the call to _chkstk and manually adjust the stack pointer if we
can prove that the allocation is fixed size and smaller than the probe
size.
This shrinks chrome.dll, chrome_child.dll and chrome.exe by a
cummulative ~133 KB.
Differential Revision: http://reviews.llvm.org/D17679
llvm-svn: 262370
Diffstat (limited to 'llvm/test/CodeGen/X86/inalloca-stdcall.ll')
| -rw-r--r-- | llvm/test/CodeGen/X86/inalloca-stdcall.ll | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/llvm/test/CodeGen/X86/inalloca-stdcall.ll b/llvm/test/CodeGen/X86/inalloca-stdcall.ll index 4f7e4092a99..ad2271bcff4 100644 --- a/llvm/test/CodeGen/X86/inalloca-stdcall.ll +++ b/llvm/test/CodeGen/X86/inalloca-stdcall.ll @@ -7,16 +7,16 @@ declare x86_stdcallcc void @i(i32 %a) define void @g() { ; CHECK-LABEL: _g: +; CHECK: movl %esp, %ebp %b = alloca inalloca %Foo -; CHECK: movl $8, %eax -; CHECK: calll __chkstk +; CHECK: movl %esp, %[[tmp_sp:.*]] +; CHECK: leal -8(%[[tmp_sp]]), %esp %f1 = getelementptr %Foo, %Foo* %b, i32 0, i32 0 %f2 = getelementptr %Foo, %Foo* %b, i32 0, i32 1 store i32 13, i32* %f1 store i32 42, i32* %f2 -; CHECK: movl %esp, %eax -; CHECK: movl $13, (%eax) -; CHECK: movl $42, 4(%eax) +; CHECK: movl $13, -8(%[[tmp_sp]]) +; CHECK: movl $42, -4(%[[tmp_sp]]) call x86_stdcallcc void @f(%Foo* inalloca %b) ; CHECK: calll _f@8 ; CHECK-NOT: %esp |
