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From cc4301f82ca1bde1d438c3708de285b0ab8c72d3 Mon Sep 17 00:00:00 2001
From: Naveen Saini <naveen.kumar.saini@intel.com>
Date: Fri, 27 Aug 2021 12:07:25 +0800
Subject: [PATCH 1/2] [X86] createVariablePermute - handle case where recursive
createVariablePermute call fails
Account for the case where a recursive createVariablePermute call with a wider vector type fails.
Original test case from @craig.topper (Craig Topper)
Upstream-Status: Backport [https://github.com/llvm/llvm-project/commit/6bdd63dc28208a597542b0c6bc41093f32417804]
Signed-off-by: Simon Pilgrim <llvm-dev@redking.me.uk>
Signed-off-by: Naveen Saini <naveen.kumar.saini@intel.com>
---
llvm/lib/Target/X86/X86ISelLowering.cpp | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index c8720d9ae3a6..63eb050e9b3a 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -9571,9 +9571,11 @@ static SDValue createVariablePermute(MVT VT, SDValue SrcVec, SDValue IndicesVec,
IndicesVT = EVT(VT).changeVectorElementTypeToInteger();
IndicesVec = widenSubVector(IndicesVT.getSimpleVT(), IndicesVec, false,
Subtarget, DAG, SDLoc(IndicesVec));
- return extractSubVector(
- createVariablePermute(VT, SrcVec, IndicesVec, DL, DAG, Subtarget), 0,
- DAG, DL, SizeInBits);
+ SDValue NewSrcVec =
+ createVariablePermute(VT, SrcVec, IndicesVec, DL, DAG, Subtarget);
+ if (NewSrcVec)
+ return extractSubVector(NewSrcVec, 0, DAG, DL, SizeInBits);
+ return SDValue();
} else if (SrcVec.getValueSizeInBits() < SizeInBits) {
// Widen smaller SrcVec to match VT.
SrcVec = widenSubVector(VT, SrcVec, false, Subtarget, DAG, SDLoc(SrcVec));
--
2.17.1
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