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R600: Add comment clariying use of sext for result of MUL_U24

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206501 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tom Stellard 2014-04-17 21:00:13 +00:00
parent 93ea1378d2
commit 52d940edcd
1 changed files with 2 additions and 0 deletions

2
lib/Target/R600/AMDGPUISelLowering.cpp

@ -1158,6 +1158,8 @@ SDValue AMDGPUTargetLowering::PerformDAGCombine(SDNode *N,
break;
}
// We need to use sext even for MUL_U24, because MUL_U24 is used
// for signed multiply of 8 and 16-bit types.
SDValue Reg = DAG.getSExtOrTrunc(Mul, DL, VT);
return Reg;