mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-24 19:52:54 +01:00
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
|
|
define i32 @test_asm_length(i32 %in) {
|
|
; CHECK-LABEL: test_asm_length:
|
|
|
|
; It would be more natural to use just one "tbnz %false" here, but if the
|
|
; number of instructions in the asm is counted reasonably, that block is out
|
|
; of the limited range we gave tbz. So branch relaxation has to invert the
|
|
; condition.
|
|
; CHECK: tbz w0, #0, [[TRUE:LBB[0-9]+_[0-9]+]]
|
|
; CHECK: b [[FALSE:LBB[0-9]+_[0-9]+]]
|
|
|
|
; CHECK: [[TRUE]]:
|
|
; CHECK: orr w0, wzr, #0x4
|
|
; CHECK: nop
|
|
; CHECK: nop
|
|
; CHECK: nop
|
|
; CHECK: nop
|
|
; CHECK: nop
|
|
; CHECK: nop
|
|
; CHECK: ret
|
|
|
|
; CHECK: [[FALSE]]:
|
|
; CHECK: ret
|
|
|
|
%val = and i32 %in, 1
|
|
%tst = icmp eq i32 %val, 0
|
|
br i1 %tst, label %true, label %false
|
|
|
|
true:
|
|
call void asm sideeffect "nop\0A\09nop\0A\09nop\0A\09nop\0A\09nop\0A\09nop", ""()
|
|
ret i32 4
|
|
|
|
false:
|
|
ret i32 0
|
|
}
|