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e9061eb73e
This is the first step toward supporting shrink-wrapping for this target.
The changes could be summarized by these items:
- Expand the tail-call return as part of the expand pseudo pass.
- Get rid of the assumptions that the epilogue is the exit block:
* Do not assume which registers are free in the epilogue. (This indirectly
improve the lowering of the code for the segmented stacks, see the test
cases.)
* Take into account that the basic block can be empty.
Related to <rdar://problem/20821730>
llvm-svn: 242714
16 lines
365 B
LLVM
16 lines
365 B
LLVM
; RUN: llc < %s -mtriple=thumb-apple-darwin | FileCheck %s
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; rdar://7268481
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define void @t(i8* %a, ...) nounwind {
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; CHECK-LABEL: t:
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; CHECK: pop {[[POP_REG:r[0-3]]]}
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; CHECK-NEXT: add sp, #12
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; CHECK-NEXT: bx [[POP_REG]]
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entry:
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%a.addr = alloca i8, i32 4
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call void @llvm.va_start(i8* %a.addr)
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ret void
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}
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declare void @llvm.va_start(i8*) nounwind
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