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; This test makes sure that these instructions are properly eliminated.
;
; RUN: opt < %s -instcombine -S | FileCheck %s
; PR1253
define i1 @test0(i32 %A) {
; CHECK-LABEL: @test0(
; CHECK: %C = icmp slt i32 %A, 0
%B = xor i32 %A, -2147483648
%C = icmp sgt i32 %B, -1
ret i1 %C
}
define i1 @test1(i32 %A) {
; CHECK-LABEL: @test1(
; CHECK: %C = icmp slt i32 %A, 0
%B = xor i32 %A, 12345
%C = icmp slt i32 %B, 0
ret i1 %C
}
; PR1014
define i32 @test2(i32 %tmp1) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: and i32 %tmp1, 32
; CHECK-NEXT: or i32 %ovm, 8
; CHECK-NEXT: ret i32
%ovm = and i32 %tmp1, 32
%ov3 = add i32 %ovm, 145
%ov110 = xor i32 %ov3, 153
ret i32 %ov110
}
define i32 @test3(i32 %tmp1) {
; CHECK-LABEL: @test3(
; CHECK-NEXT: and i32 %tmp1, 32
; CHECK-NEXT: or i32 %ovm, 8
; CHECK-NEXT: ret i32
%ovm = or i32 %tmp1, 145
%ov31 = and i32 %ovm, 177
%ov110 = xor i32 %ov31, 153
ret i32 %ov110
}
define i32 @test4(i32 %A, i32 %B) {
%1 = xor i32 %A, -1
%2 = ashr i32 %1, %B
%3 = xor i32 %2, -1
ret i32 %3
; CHECK-LABEL: @test4(
; CHECK: %1 = ashr i32 %A, %B
; CHECK: ret i32 %1
}
; defect-2 in rdar://12329730
; (X^C1) >> C2) ^ C3 -> (X>>C2) ^ ((C1>>C2)^C3)
; where the "X" has more than one use
define i32 @test5(i32 %val1) {
test5:
%xor = xor i32 %val1, 1234
%shr = lshr i32 %xor, 8
%xor1 = xor i32 %shr, 1
%add = add i32 %xor1, %xor
ret i32 %add
; CHECK-LABEL: @test5(
; CHECK: lshr i32 %val1, 8
; CHECK: ret
}
; defect-1 in rdar://12329730
; Simplify (X^Y) -> X or Y in the user's context if we know that
; only bits from X or Y are demanded.
; e.g. the "x ^ 1234" can be optimized into x in the context of "t >> 16".
; Put in other word, t >> 16 -> x >> 16.
; unsigned foo(unsigned x) { unsigned t = x ^ 1234; ; return (t >> 16) + t;}
define i32 @test6(i32 %x) {
%xor = xor i32 %x, 1234
%shr = lshr i32 %xor, 16
%add = add i32 %shr, %xor
ret i32 %add
; CHECK-LABEL: @test6(
; CHECK: lshr i32 %x, 16
; CHECK: ret
}
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