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300d65b2ea
To make sure branches are in range, we need to do a better job of estimating the length of an inline assembly block than "it's probably 1 instruction, who'd write asm with more than that?". Fortunately there's already a (highly suspect, see how many ways you can think of to break it!) callback for this purpose, which is used by the other targets. rdar://problem/17277590 llvm-svn: 211095
36 lines
955 B
LLVM
36 lines
955 B
LLVM
; RUN: llc -mtriple=aarch64-apple-ios7.0 -disable-block-placement -aarch64-tbz-offset-bits=4 -o - %s | FileCheck %s
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define i32 @test_asm_length(i32 %in) {
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; CHECK-LABEL: test_asm_length:
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; It would be more natural to use just one "tbnz %false" here, but if the
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; number of instructions in the asm is counted reasonably, that block is out
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; of the limited range we gave tbz. So branch relaxation has to invert the
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; condition.
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; CHECK: tbz w0, #0, [[TRUE:LBB[0-9]+_[0-9]+]]
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; CHECK: b [[FALSE:LBB[0-9]+_[0-9]+]]
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; CHECK: [[TRUE]]:
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; CHECK: orr w0, wzr, #0x4
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; CHECK: nop
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; CHECK: nop
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; CHECK: nop
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; CHECK: nop
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; CHECK: nop
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; CHECK: nop
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; CHECK: ret
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; CHECK: [[FALSE]]:
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; CHECK: ret
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%val = and i32 %in, 1
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%tst = icmp eq i32 %val, 0
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br i1 %tst, label %true, label %false
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true:
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call void asm sideeffect "nop\0A\09nop\0A\09nop\0A\09nop\0A\09nop\0A\09nop", ""()
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ret i32 4
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false:
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ret i32 0
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}
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