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Add DAG combine for ladd / lsub.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98057 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Osborne
2010-03-09 16:07:47 +00:00
parent 7ebc3777de
commit 7b871b3464
3 changed files with 98 additions and 0 deletions
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28
test/CodeGen/XCore/ladd_lsub_combine.ll Normal file
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; RUN: llvm-as < %s | llc -march=xcore | FileCheck %s
; Only needs one ladd
define i64 @f1(i32 %x, i32 %y) nounwind {
entry:
%0 = zext i32 %x to i64 ; <i64> [#uses=1]
%1 = zext i32 %y to i64 ; <i64> [#uses=1]
%2 = add i64 %1, %0 ; <i64> [#uses=1]
ret i64 %2
}
; CHECK: f1:
; CHECK: ldc r2, 0
; CHECK-NEXT: ladd r1, r0, r1, r0, r2
; CHECK-NEXT: retsp 0
; Only needs one lsub and one neg
define i64 @f2(i32 %x, i32 %y) nounwind {
entry:
%0 = zext i32 %x to i64 ; <i64> [#uses=1]
%1 = zext i32 %y to i64 ; <i64> [#uses=1]
%2 = sub i64 %1, %0 ; <i64> [#uses=1]
ret i64 %2
}
; CHECK: f2:
; CHECK: ldc r2, 0
; CHECK-NEXT: lsub r1, r0, r1, r0, r2
; CHECK-NEXT: neg r1, r1
; CHECK-NEXT: retsp 0