7337ee23d8
When optimizing for size, replace "addl $4, %esp" and "addl $8, %esp" following a call by one or two pops, respectively. We don't try to do it in general, but only when the stack adjustment immediately follows a call - which is the most common case. That allows taking a short-cut when trying to find a free register to pop into, instead of a full-blown liveness check. If the adjustment immediately follows a call, then every register the call clobbers but doesn't define should be dead at that point, and can be used. Differential Revision: http://reviews.llvm.org/D11749 llvm-svn: 244578
41 lines
1.1 KiB
LLVM
41 lines
1.1 KiB
LLVM
; RUN: llc < %s -mtriple=i686-windows | FileCheck %s -check-prefix=CHECK -check-prefix=NORMAL
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; RUN: llc < %s -mtriple=i686-windows -mattr=call-reg-indirect | FileCheck %s -check-prefix=CHECK -check-prefix=SLM
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declare void @foo(i32 %r)
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define void @test(i32 %a, i32 %b) optsize {
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; CHECK-LABEL: test:
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; CHECK: movl [[EAX:%e..]], (%esp)
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; CHECK-NEXT: pushl [[EAX]]
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; CHECK-NEXT: calll
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; CHECK-NEXT: addl $4, %esp
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; CHECK: nop
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; NORMAL: pushl (%esp)
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; SLM: movl (%esp), [[RELOAD:%e..]]
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; SLM-NEXT: pushl [[RELOAD]]
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; CHECK: calll
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; CHECK-NEXT: addl $4, %esp
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%c = add i32 %a, %b
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call void @foo(i32 %c)
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call void asm sideeffect "nop", "~{ax},~{bx},~{cx},~{dx},~{bp},~{si},~{di}"()
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call void @foo(i32 %c)
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ret void
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}
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define void @test_min(i32 %a, i32 %b) minsize {
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; CHECK-LABEL: test_min:
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; CHECK: movl [[EAX:%e..]], (%esp)
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; CHECK-NEXT: pushl [[EAX]]
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; CHECK-NEXT: calll
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; CHECK-NEXT: popl
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; CHECK: nop
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; CHECK: pushl (%esp)
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; CHECK: calll
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; CHECK-NEXT: popl
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%c = add i32 %a, %b
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call void @foo(i32 %c)
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call void asm sideeffect "nop", "~{ax},~{bx},~{cx},~{dx},~{bp},~{si},~{di}"()
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call void @foo(i32 %c)
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ret void
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}
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