mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-29 13:29:28 +00:00
Enhancement to InstCombine. Try to catch this opportunity: --------------------------------------------------------------- ((X^C1) >> C2) ^ C3 => (X>>C2) ^ ((C1>>C2)^C3) where the subexpression "X ^ C1" has more than one uses, and "(X^C1) >> C2" has single use. ---------------------------------------------------------------- Reviewed by Nadav (with minor change per his request). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168615 91177308-0d34-0410-b5e6-96231b3b80d8
69 lines
1.4 KiB
LLVM
69 lines
1.4 KiB
LLVM
; This test makes sure that these instructions are properly eliminated.
|
|
;
|
|
; RUN: opt < %s -instcombine -S | FileCheck %s
|
|
|
|
; PR1253
|
|
define i1 @test0(i32 %A) {
|
|
; CHECK: @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: @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: @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: @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: @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: @test5
|
|
; CHECK: lshr i32 %val1, 8
|
|
; CHECK: ret
|
|
}
|