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