mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-24 09:29:42 +00:00
1cd05bb605
the original instruction, half the cases were missed (making it not wrong but suboptimal). Also correct a typo (A <-> B) in the second chunk. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122414 91177308-0d34-0410-b5e6-96231b3b80d8
43 lines
881 B
LLVM
43 lines
881 B
LLVM
; RUN: opt < %s -instsimplify -S | FileCheck %s
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define i32 @factorize(i32 %x, i32 %y) {
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; CHECK: @factorize
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; (X | 1) & (X | 2) -> X | (1 & 2) -> X
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%l = or i32 %x, 1
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%r = or i32 %x, 2
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%z = and i32 %l, %r
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ret i32 %z
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; CHECK: ret i32 %x
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}
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define i32 @factorize2(i32 %x) {
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; CHECK: @factorize2
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; 3*X - 2*X -> X
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%l = mul i32 3, %x
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%r = mul i32 2, %x
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%z = sub i32 %l, %r
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ret i32 %z
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; CHECK: ret i32 %x
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}
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define i32 @factorize3(i32 %x, i32 %a, i32 %b) {
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; CHECK: @factorize3
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; (X | (A|B)) & (X | B) -> X | ((A|B) & B) -> X | B
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%aORb = or i32 %a, %b
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%l = or i32 %x, %aORb
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%r = or i32 %x, %b
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%z = and i32 %l, %r
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ret i32 %z
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; CHECK: ret i32 %r
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}
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define i32 @expand(i32 %x) {
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; CHECK: @expand
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; ((X & 1) | 2) & 1 -> ((X & 1) & 1) | (2 & 1) -> (X & 1) | 0 -> X & 1
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%a = and i32 %x, 1
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%b = or i32 %a, 2
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%c = and i32 %b, 1
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ret i32 %c
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; CHECK: ret i32 %a
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}
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