28 lines
919 B
LLVM
28 lines
919 B
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mattr=-bmi < %s | FileCheck %s --check-prefix=CHECK-NOBMI
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; RUN: llc -mtriple=x86_64-unknown-linux-gnu -mattr=+bmi < %s | FileCheck %s --check-prefix=CHECK-BMI
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; Optimize (x > -1) to (x >= 0) etc.
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; Optimize (cmp (add / sub), 0): eliminate the subs used to update flag
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; for comparison only
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; rdar://10233472
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define i32 @t1(i64 %a) {
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; CHECK-NOBMI-LABEL: t1:
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; CHECK-NOBMI: # %bb.0:
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; CHECK-NOBMI-NEXT: xorl %eax, %eax
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; CHECK-NOBMI-NEXT: testq %rdi, %rdi
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; CHECK-NOBMI-NEXT: setns %al
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; CHECK-NOBMI-NEXT: retq
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;
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; CHECK-BMI-LABEL: t1:
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; CHECK-BMI: # %bb.0:
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; CHECK-BMI-NEXT: xorl %eax, %eax
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; CHECK-BMI-NEXT: testq %rdi, %rdi
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; CHECK-BMI-NEXT: setns %al
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; CHECK-BMI-NEXT: retq
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%cmp = icmp sgt i64 %a, -1
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%conv = zext i1 %cmp to i32
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ret i32 %conv
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}
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