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[LV] Fix for PR38110, LV encountered llvm_unreachable()
Summary: truncateToMinimalBitWidths() doesn't handle all Instructions and the worst case is compiler crash via llvm_unreachable(). Fix is to add a case to handle PHINode and changed the worst case to NO-OP (from compiler crash). Reviewers: sbaranga, mssimpso, hsaito Reviewed By: hsaito Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D49461 llvm-svn: 337861
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; RUN: opt -passes='loop-vectorize' -mcpu=z13 -force-vector-width=2 -S < %s | FileCheck %s | ||
; | ||
; Forcing VF=2 to trigger vector code gen | ||
; | ||
; This is a test case to exercise more cases in truncateToMinimalBitWidths(). | ||
; Test passes if vector code is generated w/o hitting llvm_unreachable(). | ||
; | ||
; Performing minimal check in the output to ensure the loop is actually | ||
; vectorized. | ||
; | ||
; CHECK: vector.body | ||
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target datalayout = "E-m:e-i1:8:16-i8:8:16-i64:64-f128:64-v128:64-a:8:16-n32:64" | ||
target triple = "s390x-ibm-linux" | ||
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define void @test(i32 zeroext %width, i8* nocapture %row, i16 zeroext %src, i16* nocapture readonly %dst) { | ||
entry: | ||
%cmp10 = icmp eq i32 %width, 0 | ||
br i1 %cmp10, label %for.end, label %for.body.lr.ph | ||
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for.body.lr.ph: ; preds = %entry | ||
%conv1 = zext i16 %src to i32 | ||
br label %for.body | ||
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for.body: ; preds = %for.inc, %for.body.lr.ph | ||
%i.012 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.inc ] | ||
%sp.011 = phi i8* [ %row, %for.body.lr.ph ], [ %incdec.ptr, %for.inc ] | ||
%0 = load i8, i8* %sp.011, align 1 | ||
%conv = zext i8 %0 to i32 | ||
%cmp2 = icmp eq i32 %conv, %conv1 | ||
br i1 %cmp2, label %if.then, label %for.inc | ||
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if.then: ; preds = %for.body | ||
%1 = load i16, i16* %dst, align 2 | ||
%conv4 = trunc i16 %1 to i8 | ||
store i8 %conv4, i8* %sp.011, align 1 | ||
br label %for.inc | ||
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for.inc: ; preds = %for.body, %if.then | ||
%inc = add nuw i32 %i.012, 1 | ||
%incdec.ptr = getelementptr inbounds i8, i8* %sp.011, i64 1 | ||
%exitcond = icmp eq i32 %inc, %width | ||
br i1 %exitcond, label %for.end.loopexit, label %for.body | ||
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for.end.loopexit: ; preds = %for.inc | ||
br label %for.end | ||
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for.end: ; preds = %for.end.loopexit, %entry | ||
ret void | ||
} |