From 10de2775bd31d332f2f1a2a62634eff78cf9d31f Mon Sep 17 00:00:00 2001 From: Matt Arsenault Date: Tue, 28 Aug 2018 18:10:02 +0000 Subject: AMDGPU: Remove nan tests in class if src is nnan llvm-svn: 340850 --- llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'llvm/lib/Transforms') diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp index 1d0cd11f941..2993f0095a6 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp @@ -3282,6 +3282,13 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) { return replaceInstUsesWith(*II, FCmp); } + // fp_class (nnan x), qnan|snan|other -> fp_class (nnan x), other + if (((Mask & S_NAN) || (Mask & Q_NAN)) && isKnownNeverNaN(Src0, &TLI)) { + II->setArgOperand(1, ConstantInt::get(Src1->getType(), + Mask & ~(S_NAN | Q_NAN))); + return II; + } + const ConstantFP *CVal = dyn_cast(Src0); if (!CVal) { if (isa(Src0)) -- cgit v1.2.3