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
62 lines
1.6 KiB
LLVM
62 lines
1.6 KiB
LLVM
; RUN: llc < %s -mtriple=i686-windows | FileCheck %s -check-prefix=CHECK -check-prefix=NORMAL
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declare void @param1(i32 %a)
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declare i32 @param2_ret(i32 %a, i32 %b)
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declare i64 @param2_ret64(i32 %a, i32 %b)
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declare void @param2(i32 %a, i32 %b)
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declare void @param3(i32 %a, i32 %b, i32 %c)
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define void @test() minsize {
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; CHECK-LABEL: test:
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; CHECK: calll _param1
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; CHECK-NEXT: popl %eax
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; CHECK: calll _param2
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; CHECK-NEXT: popl %eax
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; CHECK-NEXT: popl %ecx
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; CHECK: calll _param2_ret
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; CHECK-NEXT: popl %ecx
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; CHECK-NEXT: popl %edx
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; CHECK-NEXT: pushl %eax
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; CHECK: calll _param3
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; CHECK-NEXT: addl $12, %esp
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; CHECK: calll _param2_ret64
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; CHECK-NEXT: popl %ecx
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; CHECK-NEXT: popl %ecx
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call void @param1(i32 1)
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call void @param2(i32 1, i32 2)
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%ret = call i32 @param2_ret(i32 1, i32 2)
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call void @param3(i32 1, i32 2, i32 %ret)
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%ret64 = call i64 @param2_ret64(i32 1, i32 2)
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ret void
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}
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define void @negative(i32 %k) {
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; CHECK-LABEL: negative:
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; CHECK: calll _param1
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; CHECK-NEXT: addl $4, %esp
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; CHECK: calll _param2
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; CHECK-NEXT: addl $8, %esp
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; CHECK: calll _param3
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; CHECK-NEXT: movl %ebp, %esp
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%v = alloca i32, i32 %k
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call void @param1(i32 1)
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call void @param2(i32 1, i32 2)
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call void @param3(i32 1, i32 2, i32 3)
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ret void
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}
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define void @spill(i32 inreg %a, i32 inreg %b, i32 inreg %c) minsize {
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; CHECK-LABEL: spill:
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; CHECK-DAG: movl %ecx,
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; CHECK-DAG: movl %edx,
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; CHECK: calll _param2_ret
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; CHECK-NEXT: popl %ecx
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; CHECK-NEXT: popl %edx
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; CHECK-DAG: movl {{.*}}, %ecx
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; CHECK-DAG: movl {{.*}}, %edx
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; CHECK: calll _spill
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%i = call i32 @param2_ret(i32 1, i32 2)
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call void @spill(i32 %a, i32 %b, i32 %c)
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ret void
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}
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