mirror of
https://github.com/c64scene-ar/llvm-6502.git
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b2f3c383ec
These were not recommended by my auto-simplifier since they don't fire often enough. However they do fire from time to time, for example they remove one subtraction from the final bitcode for 483.xalancbmk. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123755 91177308-0d34-0410-b5e6-96231b3b80d8
93 lines
1.5 KiB
LLVM
93 lines
1.5 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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define i32 @sub1(i32 %x, i32 %y) {
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; CHECK: @sub1
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%d = sub i32 %x, %y
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%r = sub i32 %x, %d
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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 @sub2(i32 %x) {
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; CHECK: @sub2
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; X - (X + 1) -> -1
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%xp1 = add i32 %x, 1
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%r = sub i32 %x, %xp1
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ret i32 %r
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; CHECK: ret i32 -1
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}
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define i32 @sub3(i32 %x, i32 %y) {
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; CHECK: @sub3
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; ((X + 1) + Y) - (Y + 1) -> X
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%xp1 = add i32 %x, 1
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%lhs = add i32 %xp1, %y
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%rhs = add i32 %y, 1
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%r = sub i32 %lhs, %rhs
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ret i32 %r
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; CHECK: ret i32 %x
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}
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