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fe6fe553f7
The size savings are significant, and from what I can tell, both ICC and GCC do this. Differential Revision: http://reviews.llvm.org/D18573 llvm-svn: 264966
24 lines
785 B
LLVM
24 lines
785 B
LLVM
; RUN: llc < %s -mtriple=i686-unknown-linux -tailcallopt -no-x86-call-frame-opt | FileCheck %s
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; Linux has 8 byte alignment so the params cause stack size 20 when tailcallopt
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; is enabled, ensure that a normal fastcc call has matching stack size
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define fastcc i32 @tailcallee(i32 %a1, i32 %a2, i32 %a3, i32 %a4) {
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ret i32 %a3
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}
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define fastcc i32 @tailcaller(i32 %in1, i32 %in2, i32 %in3, i32 %in4) {
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%tmp11 = tail call fastcc i32 @tailcallee(i32 %in1, i32 %in2,
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i32 %in1, i32 %in2)
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ret i32 %tmp11
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}
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define i32 @main(i32 %argc, i8** %argv) {
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%tmp1 = call fastcc i32 @tailcaller( i32 1, i32 2, i32 3, i32 4 )
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; expect match subl [stacksize] here
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ret i32 0
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}
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; CHECK: calll tailcaller
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; CHECK-NEXT: subl $12
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