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dc51b0ee48
simplification present in fully optimized code (I think instcombine fails to transform some of these when "X-Y" has more than one use). Fires here and there all over the test-suite, for example it eliminates 8 subtractions in the final IR for 445.gobmk, 2 subs in 447.dealII, 2 in paq8p etc. llvm-svn: 123442
73 lines
1.2 KiB
LLVM
73 lines
1.2 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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