InstCombine: Fold cos(-x) -> cos(x)
Also cos(fabs(x)) -> cos(x)
llvm-svn: 291022
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
index f863d19..b29ed3c 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
@@ -1637,6 +1637,20 @@
break;
}
+ case Intrinsic::cos:
+ case Intrinsic::amdgcn_cos: {
+ Value *SrcSrc;
+ Value *Src = II->getArgOperand(0);
+ if (match(Src, m_FNeg(m_Value(SrcSrc))) ||
+ match(Src, m_Intrinsic<Intrinsic::fabs>(m_Value(SrcSrc)))) {
+ // cos(-x) -> cos(x)
+ // cos(fabs(x)) -> cos(x)
+ II->setArgOperand(0, SrcSrc);
+ return II;
+ }
+
+ break;
+ }
case Intrinsic::ppc_altivec_lvx:
case Intrinsic::ppc_altivec_lvxl:
// Turn PPC lvx -> load if the pointer is known aligned.