mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-01-02 22:32:38 +00:00
2d10010649
rule 1: (x | c1) ^ c2 => (x & ~c1) ^ (c1^c2), only useful when c1=c2 rule 2: (x & c1) ^ (x & c2) = (x & (c1^c2)) rule 3: (x | c1) ^ (x | c2) = (x & c3) ^ c3 where c3 = c1 ^ c2 rule 4: (x | c1) ^ (x & c2) => (x & c3) ^ c1, where c3 = ~c1 ^ c2 It reduces an application's size (in terms of # of instructions) by 8.9%. Reviwed by Pete Cooper. Thanks a lot! rdar://13212115 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178409 91177308-0d34-0410-b5e6-96231b3b80d8
152 lines
3.5 KiB
LLVM
152 lines
3.5 KiB
LLVM
;RUN: opt -S -reassociate < %s | FileCheck %s
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; ==========================================================================
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;
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; Xor reassociation general cases
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;
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; ==========================================================================
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; (x | c1) ^ (x | c2) => (x & c3) ^ c3, where c3 = c1^c2
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;
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define i32 @xor1(i32 %x) {
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%or = or i32 %x, 123
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%or1 = or i32 %x, 456
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%xor = xor i32 %or, %or1
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ret i32 %xor
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;CHECK: @xor1
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;CHECK: %and.ra = and i32 %x, 435
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;CHECK: %xor = xor i32 %and.ra, 435
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}
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; Test rule : (x & c1) ^ (x & c2) = (x & (c1^c2))
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; Real testing case : (x & 123) ^ y ^ (x & 345) => (x & 435) ^ y
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define i32 @xor2(i32 %x, i32 %y) {
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%and = and i32 %x, 123
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%xor = xor i32 %and, %y
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%and1 = and i32 %x, 456
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%xor2 = xor i32 %xor, %and1
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ret i32 %xor2
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;CHECK: @xor2
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;CHECK: %and.ra = and i32 %x, 435
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;CHECK: %xor2 = xor i32 %and.ra, %y
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}
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; Test rule: (x | c1) ^ (x & c2) = (x & c3) ^ c1, where c3 = ~c1 ^ c2
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; c3 = ~c1 ^ c2
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define i32 @xor3(i32 %x, i32 %y) {
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%or = or i32 %x, 123
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%xor = xor i32 %or, %y
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%and = and i32 %x, 456
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%xor1 = xor i32 %xor, %and
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ret i32 %xor1
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;CHECK: @xor3
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;CHECK: %and.ra = and i32 %x, -436
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;CHECK: %xor = xor i32 %y, 123
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;CHECK: %xor1 = xor i32 %xor, %and.ra
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}
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; Test rule: (x | c1) ^ c2 = (x & ~c1) ^ (c1 ^ c2)
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define i32 @xor4(i32 %x, i32 %y) {
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%and = and i32 %x, -124
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%xor = xor i32 %y, 435
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%xor1 = xor i32 %xor, %and
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ret i32 %xor1
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; CHECK: @xor4
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; CHECK: %and = and i32 %x, -124
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; CHECK: %xor = xor i32 %y, 435
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; CHECK: %xor1 = xor i32 %xor, %and
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}
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; ==========================================================================
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;
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; Xor reassociation special cases
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;
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; ==========================================================================
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; Special case1:
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; (x | c1) ^ (x & ~c1) = c1
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define i32 @xor_special1(i32 %x, i32 %y) {
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%or = or i32 %x, 123
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%xor = xor i32 %or, %y
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%and = and i32 %x, -124
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%xor1 = xor i32 %xor, %and
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ret i32 %xor1
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; CHECK: @xor_special1
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; CHECK: %xor1 = xor i32 %y, 123
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; CHECK: ret i32 %xor1
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}
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; Special case1:
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; (x | c1) ^ (x & c1) = x ^ c1
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define i32 @xor_special2(i32 %x, i32 %y) {
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%or = or i32 %x, 123
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%xor = xor i32 %or, %y
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%and = and i32 %x, 123
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%xor1 = xor i32 %xor, %and
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ret i32 %xor1
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; CHECK: @xor_special2
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; CHECK: %xor = xor i32 %y, 123
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; CHECK: %xor1 = xor i32 %xor, %x
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; CHECK: ret i32 %xor1
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}
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; (x | c1) ^ (x | c1) => 0
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define i32 @xor_special3(i32 %x) {
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%or = or i32 %x, 123
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%or1 = or i32 %x, 123
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%xor = xor i32 %or, %or1
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ret i32 %xor
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;CHECK: @xor_special3
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;CHECK: ret i32 0
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}
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; (x & c1) ^ (x & c1) => 0
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define i32 @xor_special4(i32 %x) {
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%or = and i32 %x, 123
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%or1 = and i32 123, %x
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%xor = xor i32 %or, %or1
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ret i32 %xor
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;CHECK: @xor_special4
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;CHECK: ret i32 0
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}
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; ==========================================================================
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;
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; Xor reassociation curtail code size
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;
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; ==========================================================================
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; (x | c1) ^ (x | c2) => (x & c3) ^ c3
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; is enabled if one of operands has multiple uses
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;
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define i32 @xor_ra_size1(i32 %x) {
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%or = or i32 %x, 123
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%or1 = or i32 %x, 456
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%xor = xor i32 %or, %or1
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%add = add i32 %xor, %or
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ret i32 %add
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;CHECK: @xor_ra_size1
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;CHECK: %xor = xor i32 %and.ra, 435
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}
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; (x | c1) ^ (x | c2) => (x & c3) ^ c3
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; is disenabled if bothf operands has multiple uses.
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;
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define i32 @xor_ra_size2(i32 %x) {
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%or = or i32 %x, 123
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%or1 = or i32 %x, 456
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%xor = xor i32 %or, %or1
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%add = add i32 %xor, %or
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%add2 = add i32 %add, %or1
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ret i32 %add2
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;CHECK: @xor_ra_size2
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;CHECK: %or1 = or i32 %x, 456
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;CHECK: %xor = xor i32 %or, %or1
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}
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