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[AArch64] Change EON pattern to match more often.

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Phabricator: http://reviews.llvm.org/D11359
Patch by Geoff Berry <gberry@codeaurora.org>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242694 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier 2015-07-20 18:42:27 +00:00
parent 1cc7da7305
commit fccc20d417
2 changed files with 30 additions and 1 deletions
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2
lib/Target/AArch64/AArch64InstrInfo.td
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@ -841,7 +841,7 @@ defm AND : LogicalReg<0b00, 0, "and", and>;
defm BIC : LogicalReg<0b00, 1, "bic",
BinOpFrag<(and node:$LHS, (not node:$RHS))>>;
defm EON : LogicalReg<0b10, 1, "eon",
BinOpFrag<(xor node:$LHS, (not node:$RHS))>>;
BinOpFrag<(not (xor node:$LHS, node:$RHS))>>;
defm EOR : LogicalReg<0b10, 0, "eor", xor>;
defm ORN : LogicalReg<0b01, 1, "orn",
BinOpFrag<(or node:$LHS, (not node:$RHS))>>;

29
test/CodeGen/AArch64/eon.ll Normal file
View File

@ -0,0 +1,29 @@
; RUN: llc -mtriple=aarch64-none-linux-gnu < %s | FileCheck %s
; Check that the eon instruction is generated instead of eor,movn
define i64 @test1(i64 %a, i64 %b, i64 %c) {
; CHECK-LABEL: test1:
; CHECK: eon
; CHECK: ret
entry:
%shl = shl i64 %b, 4
%neg = xor i64 %a, -1
%xor = xor i64 %shl, %neg
ret i64 %xor
}
; Same check with mutliple uses of %neg
define i64 @test2(i64 %a, i64 %b, i64 %c) {
; CHECK-LABEL: test2:
; CHECK: eon
; CHECK: eon
; CHECK: lsl
; CHECK: ret
entry:
%shl = shl i64 %b, 4
%neg = xor i64 %shl, -1
%xor = xor i64 %neg, %a
%xor1 = xor i64 %c, %neg
%shl2 = shl i64 %xor, %xor1
ret i64 %shl2
}