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https://github.com/c64scene-ar/llvm-6502.git
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566edb04b8
a couple of existing transforms. This fires surprisingly often, for example when compiling gcc "(X+(-1))+1->X" fires quite a lot as well as various "and" simplifications (usually with a phi node operand). Most of the time this doesn't make a real difference since the same thing would have been done elsewhere anyway, eg: by instcombine, but there are a few places where this results in simplifications that we were not doing before. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122326 91177308-0d34-0410-b5e6-96231b3b80d8
65 lines
1.1 KiB
LLVM
65 lines
1.1 KiB
LLVM
; RUN: opt < %s -instsimplify -S | FileCheck %s
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define i32 @add1(i32 %x) {
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; CHECK: @add1
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; (X + -1) + 1 -> X
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%l = add i32 %x, -1
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%r = add i32 %l, 1
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ret i32 %r
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; CHECK: ret i32 %x
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}
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define i32 @and1(i32 %x, i32 %y) {
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; CHECK: @and1
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; (X & Y) & X -> X & Y
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%l = and i32 %x, %y
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%r = and i32 %l, %x
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ret i32 %r
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; CHECK: ret i32 %l
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}
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define i32 @and2(i32 %x, i32 %y) {
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; CHECK: @and2
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; X & (X & Y) -> X & Y
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%r = and i32 %x, %y
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%l = and i32 %x, %r
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ret i32 %l
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; CHECK: ret i32 %r
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}
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define i32 @or1(i32 %x, i32 %y) {
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; CHECK: @or1
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; (X | Y) | X -> X | Y
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%l = or i32 %x, %y
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%r = or i32 %l, %x
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ret i32 %r
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; CHECK: ret i32 %l
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}
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define i32 @or2(i32 %x, i32 %y) {
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; CHECK: @or2
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; X | (X | Y) -> X | Y
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%r = or i32 %x, %y
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%l = or i32 %x, %r
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ret i32 %l
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; CHECK: ret i32 %r
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}
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define i32 @xor1(i32 %x, i32 %y) {
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; CHECK: @xor1
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; (X ^ Y) ^ X = Y
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%l = xor i32 %x, %y
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%r = xor i32 %l, %x
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ret i32 %r
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; CHECK: ret i32 %y
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}
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define i32 @xor2(i32 %x, i32 %y) {
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; CHECK: @xor2
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; X ^ (X ^ Y) = Y
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%r = xor i32 %x, %y
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%l = xor i32 %x, %r
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ret i32 %l
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; CHECK: ret i32 %y
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}
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