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8682e9a796
When deciding if it is safe to optimize a conditional branch to a CBZ or CBNZ the offsets of the BasicBlocks from the start of the function are estimated. For inline assembly the generic getInlineAsmLength() function is used to get a worst case estimate of the inline assembly by multiplying the number of instructions by the max instruction size of 4 bytes. This unfortunately doesn't take into account the generation of Thumb implicit IT instructions. In edge cases such as when all the instructions in the block are 4-bytes in size and there is an implicit IT then the size is underestimated. This can cause an out of range CBZ or CBNZ to be generated. The patch takes a conservative approach and assumes that every instruction in the inline assembly block may have an implicit IT. Fixes pr31805 Differential Revision: https://reviews.llvm.org/D52834 llvm-svn: 343960
48 lines
1.9 KiB
LLVM
48 lines
1.9 KiB
LLVM
;RUN: llc -O2 -mtriple=thumbv7a-linux-gnueabihf -arm-implicit-it=always %s -o - | FileCheck %s
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;RUN: llc -O2 -mtriple=thumbv7a-linux-gnueabihf -no-integrated-as %s -o - | FileCheck %s
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; Check that we do not produce a CBZ instruction to jump over the inline
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; assembly as the distance is too far if the implicit IT instructions are
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; added.
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define void @f0(i32 %p1, i32 %p2, i32 %p3) nounwind {
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entry:
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%cmp = icmp eq i32 %p1, 0
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br i1 %cmp, label %if.else, label %if.then
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if.then:
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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tail call void asm sideeffect "movseq r0, #0\0A", ""()
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br label %if.end
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if.else:
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tail call void asm sideeffect "nop\0A", ""()
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br label %if.end
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if.end:
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ret void
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}
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; CHECK-LABEL: f0:
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; CHECK: beq .LBB0_{{[0-9]+}}
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