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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
; Transform
; z = (~x) & y
; into:
; z = ~(x | (~y))
; iff y is free to invert and all uses of z can be freely updated.
declare void @use1(i1)
; Most basic positive test
define i32 @t0(i1 %i0, i32 %v0, i32 %v1, i32 %v2, i32 %v3) {
; CHECK-LABEL: @t0(
; CHECK-NEXT: [[I1:%.*]] = icmp ne i32 [[V0:%.*]], [[V1:%.*]]
; CHECK-NEXT: [[TMP1:%.*]] = or i1 [[I1]], [[I0:%.*]]
; CHECK-NEXT: [[I4:%.*]] = select i1 [[TMP1]], i32 [[V3:%.*]], i32 [[V2:%.*]]
; CHECK-NEXT: ret i32 [[I4]]
;
%i1 = icmp eq i32 %v0, %v1
%i2 = xor i1 %i0, -1
%i3 = and i1 %i2, %i1
%i4 = select i1 %i3, i32 %v2, i32 %v3
ret i32 %i4
}
define i32 @t1(i32 %v0, i32 %v1, i32 %v2, i32 %v3, i32 %v4, i32 %v5) {
; CHECK-LABEL: @t1(
; CHECK-NEXT: [[I0:%.*]] = icmp eq i32 [[V0:%.*]], [[V1:%.*]]
; CHECK-NEXT: [[I1:%.*]] = icmp ne i32 [[V2:%.*]], [[V3:%.*]]
; CHECK-NEXT: call void @use1(i1 [[I0]])
; CHECK-NEXT: [[TMP1:%.*]] = or i1 [[I0]], [[I1]]
; CHECK-NEXT: [[I4:%.*]] = select i1 [[TMP1]], i32 [[V5:%.*]], i32 [[V4:%.*]]
; CHECK-NEXT: ret i32 [[I4]]
;
%i0 = icmp eq i32 %v0, %v1
%i1 = icmp eq i32 %v2, %v3
call void @use1(i1 %i0)
%i2 = xor i1 %i0, -1
%i3 = and i1 %i2, %i1
%i4 = select i1 %i3, i32 %v4, i32 %v5
ret i32 %i4
}
; All users of %i3 must be invertible
define i1 @n2(i1 %i0, i32 %v0, i32 %v1, i32 %v2, i32 %v3) {
; CHECK-LABEL: @n2(
; CHECK-NEXT: [[I1:%.*]] = icmp eq i32 [[V0:%.*]], [[V1:%.*]]
; CHECK-NEXT: [[I2:%.*]] = xor i1 [[I0:%.*]], true
; CHECK-NEXT: [[I3:%.*]] = and i1 [[I1]], [[I2]]
; CHECK-NEXT: ret i1 [[I3]]
;
%i1 = icmp eq i32 %v0, %v1
%i2 = xor i1 %i0, -1
%i3 = and i1 %i2, %i1
ret i1 %i3 ; can not be inverted
}
; %i1 must be invertible
define i32 @n3(i1 %i0, i32 %v0, i32 %v1, i32 %v2, i32 %v3) {
; CHECK-LABEL: @n3(
; CHECK-NEXT: [[I1:%.*]] = icmp eq i32 [[V0:%.*]], [[V1:%.*]]
; CHECK-NEXT: call void @use1(i1 [[I1]])
; CHECK-NEXT: [[I2:%.*]] = xor i1 [[I0:%.*]], true
; CHECK-NEXT: [[I3:%.*]] = and i1 [[I1]], [[I2]]
; CHECK-NEXT: [[I4:%.*]] = select i1 [[I3]], i32 [[V2:%.*]], i32 [[V3:%.*]]
; CHECK-NEXT: ret i32 [[I4]]
;
%i1 = icmp eq i32 %v0, %v1 ; has extra uninvertible use
call void @use1(i1 %i1) ; bad extra use
%i2 = xor i1 %i0, -1
%i3 = and i1 %i2, %i1
%i4 = select i1 %i3, i32 %v2, i32 %v3
ret i32 %i4
}
; FIXME: we could invert all uses of %i1 here
define i32 @n4(i1 %i0, i32 %v0, i32 %v1, i32 %v2, i32 %v3, i32 %v4, i32 %v5, i32* %dst) {
; CHECK-LABEL: @n4(
; CHECK-NEXT: [[I1:%.*]] = icmp eq i32 [[V0:%.*]], [[V1:%.*]]
; CHECK-NEXT: [[I2:%.*]] = select i1 [[I1]], i32 [[V2:%.*]], i32 [[V3:%.*]]
; CHECK-NEXT: store i32 [[I2]], i32* [[DST:%.*]], align 4
; CHECK-NEXT: [[I3:%.*]] = xor i1 [[I0:%.*]], true
; CHECK-NEXT: [[I4:%.*]] = and i1 [[I1]], [[I3]]
; CHECK-NEXT: [[I5:%.*]] = select i1 [[I4]], i32 [[V4:%.*]], i32 [[V5:%.*]]
; CHECK-NEXT: ret i32 [[I5]]
;
%i1 = icmp eq i32 %v0, %v1 ; has extra invertible use
%i2 = select i1 %i1, i32 %v2, i32 %v3 ; invertible use
store i32 %i2, i32* %dst
%i3 = xor i1 %i0, -1
%i4 = and i1 %i3, %i1
%i5 = select i1 %i4, i32 %v4, i32 %v5
ret i32 %i5
}
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