derek.holloway
7502bf64a4
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41 lines
1.2 KiB
LLVM
41 lines
1.2 KiB
LLVM
; RUN: llc < %s -mtriple=aarch64-linux-gnu | FileCheck %s
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; Test function which compares two integers and returns the value of
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; the overflow flag, by using an asm goto to make the asm block branch
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; based on that flag, and then a phi to set the return value based on
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; whether the branch was taken.
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define i32 @overflow(i64 %a, i64 %b) #0 {
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asm:
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callbr void asm sideeffect "cmp $0, $1 \0A\09 b.vs ${2:l}",
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"r,r,!i,~{cc}"(i64 %a, i64 %b)
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to label %fallthrough [label %indirect]
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indirect:
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br label %fallthrough
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fallthrough:
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; Return 1 if we came via the 'indirect' block (because the b.vs was
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; taken), and 0 if we came straight from the asm block (because it
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; was untaken).
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%retval = phi i32 [0, %asm], [1, %indirect]
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ret i32 %retval
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}
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; CHECK: overflow:
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; CHECK-NEXT: .cfi_startproc
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; CHECK-NEXT: // %bb.{{[0-9]+}}:
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; CHECK-NEXT: bti c
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; CHECK-NEXT: //APP
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; CHECK-NEXT: cmp x0, x1
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; CHECK-NEXT: b.vs [[LABEL:\.[A-Za-z0-9_]+]]
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; CHECK-NEXT: //NO_APP
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; CHECK-NEXT: // %bb.{{[0-9]+}}:
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; CHECK-NEXT: mov w0, wzr
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; CHECK-NEXT: ret
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; CHECK-NEXT: [[LABEL]]:
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; CHECK-NOT: bti
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; CHECK: mov w0, #1
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; CHECK-NEXT: ret
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attributes #0 = { "branch-target-enforcement" "target-features"="+bti" }
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