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c66cdf74a9
basic tests. This has been well tested on Darwin but not elsewhere. It should work provided the linker correctly resolves B.W <label in other function> which it has not seen before, at least from llvm-based compilers. I'm leaving the arm-tail-calls switch in until I see if there's any problems because of that; it might need to be disabled for some environments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106299 91177308-0d34-0410-b5e6-96231b3b80d8
24 lines
714 B
LLVM
24 lines
714 B
LLVM
; RUN: llc < %s -march=arm -mtriple=arm-apple-darwin | \
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; RUN: grep cmpne | count 1
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; RUN: llc < %s -march=arm -mtriple=arm-apple-darwin | \
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; RUN: grep bhi | count 1
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; Here, tail call wins over eliminating branches. It is 1 fewer instruction
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; and removes all stack accesses, so seems like a win.
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define void @foo(i32 %X, i32 %Y) {
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entry:
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%tmp1 = icmp ult i32 %X, 4 ; <i1> [#uses=1]
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%tmp4 = icmp eq i32 %Y, 0 ; <i1> [#uses=1]
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%tmp7 = or i1 %tmp4, %tmp1 ; <i1> [#uses=1]
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br i1 %tmp7, label %cond_true, label %UnifiedReturnBlock
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cond_true: ; preds = %entry
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%tmp10 = tail call i32 (...)* @bar( ) ; <i32> [#uses=0]
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ret void
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UnifiedReturnBlock: ; preds = %entry
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ret void
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}
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declare i32 @bar(...)
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