1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
|
; RUN: opt < %s -instcombine -S | FileCheck %s
; Remove an icmp by using its operand in the subsequent logic directly.
define i8 @zext_or_icmp_icmp(i8 %a, i8 %b) {
%mask = and i8 %a, 1
%toBool1 = icmp eq i8 %mask, 0
%toBool2 = icmp eq i8 %b, 0
%bothCond = or i1 %toBool1, %toBool2
%zext = zext i1 %bothCond to i8
ret i8 %zext
; CHECK-LABEL: zext_or_icmp_icmp(
; CHECK-NEXT: %mask = and i8 %a, 1
; CHECK-NEXT: %toBool2 = icmp eq i8 %b, 0
; CHECK-NEXT: %toBool22 = zext i1 %toBool2 to i8
; CHECK-NEXT: %1 = xor i8 %mask, 1
; CHECK-NEXT: %zext = or i8 %1, %toBool22
; CHECK-NEXT: ret i8 %zext
}
|
