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DAGCombine: Make sure we only eliminate trunc/extend when the scales …
…of truncation and extension match. This fixes PR33368. Reviewer: rksimon Differential Revision: https://reviews.llvm.org/D34069 llvm-svn: 306345
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Original file line number | Diff line number | Diff line change |
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; RUN: llc -mtriple=x86_64-- -O2 -start-after=stack-protector -stop-before=loops %s -o - | FileCheck %s | ||
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; This test verifies the fix for PR33368. | ||
; | ||
; The expected outcome of the operation is to store bytes 0 and 2 of the incoming | ||
; parameter into c2 (a 2 x i8 vector). DAGCombine converts shuffles into a | ||
; sequence of extend and subsequent truncate operations. The bug was that an extension | ||
; by 4 followed by a truncation by 8 was completely eliminated. | ||
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; The test checks for the correct sequence of operations that results from the | ||
; preservation of the extend/truncate operations mentioned above (2 extend and | ||
; 3 truncate instructions). | ||
; | ||
; NOTE: This operation could be collapsed in to a single truncate. Once that is done | ||
; this test will have to be adjusted. | ||
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; CHECK: PUNPCKLBWrr | ||
; CHECK: PUNPCKLWDrr | ||
; CHECK: PACKUSWBrr | ||
; CHECK: PACKUSWBrr | ||
; CHECK: PACKUSWBrr | ||
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define void @test(double %vec.coerce) local_unnamed_addr { | ||
entry: | ||
%c2 = alloca <2 x i8>, align 2 | ||
%0 = bitcast double %vec.coerce to <8 x i8> | ||
%1 = shufflevector <8 x i8> %0, <8 x i8> undef, <4 x i32> <i32 2, i32 undef, i32 undef, i32 0> | ||
%2 = shufflevector <4 x i8> %1, <4 x i8> undef, <2 x i32> <i32 3, i32 0> | ||
store volatile <2 x i8> %2, <2 x i8>* %c2, align 2 | ||
br label %if.end | ||
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if.end: | ||
%3 = bitcast <2 x i8> %2 to i16 | ||
ret void | ||
} |