mirror of
https://github.com/RPCS3/llvm.git
synced 2024-12-28 07:05:03 +00:00
33 lines
672 B
LLVM
33 lines
672 B
LLVM
|
; RUN: opt -instcombine %s -S | FileCheck %s
|
||
|
|
|
||
|
|
; Check that code corresponding to the following C function is
|
||
|
|
; simplified into a single ASR operation:
|
||
|
|
;
|
||
|
|
; int test_asr(int a, int b) {
|
||
|
|
; return a < 0 ? -(-a - 1 >> b) - 1 : a >> b;
|
||
|
|
; }
|
||
|
|
;
|
||
|
|
define i32 @test_asr(i32 %a, i32 %b) {
|
||
|
|
entry:
|
||
|
|
%c = icmp slt i32 %a, 0
|
||
|
|
br i1 %c, label %bb2, label %bb3
|
||
|
|
|
||
|
|
bb2:
|
||
|
|
%t1 = sub i32 0, %a
|
||
|
|
%not = sub i32 %t1, 1
|
||
|
|
%d = ashr i32 %not, %b
|
||
|
|
%t2 = sub i32 0, %d
|
||
|
|
%not2 = sub i32 %t2, 1
|
||
|
|
br label %bb4
|
||
|
|
bb3:
|
||
|
|
%e = ashr i32 %a, %b
|
||
|
|
br label %bb4
|
||
|
|
bb4:
|
||
|
|
%f = phi i32 [ %not2, %bb2 ], [ %e, %bb3 ]
|
||
|
|
ret i32 %f
|
||
|
|
; CHECK: @test_asr
|
||
|
|
; CHECK: bb4:
|
||
|
|
; CHECK: %f = ashr i32 %a, %b
|
||
|
|
; CHECK: ret i32 %f
|
||
|
|
}
|