; 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-LABEL: @test_asr( | |
; CHECK: bb4: | |
; CHECK: %f = ashr i32 %a, %b | |
; CHECK: ret i32 %f | |
} |