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Fix a register scavenger crash when dealing with undefined subregs.

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The LowerSubregs pass needs to preserve implicit def operands attached to
EXTRACT_SUBREG instructions when it replaces those instructions with copies.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107189 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2010-06-29 18:42:49 +00:00
parent 721ef73d88
commit 5d52165e4e
2 changed files with 33 additions and 0 deletions
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15
test/CodeGen/ARM/2010-06-29-SubregImpDefs.ll Normal file
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@@ -0,0 +1,15 @@
; RUN: llc < %s -march=arm -mattr=+neon
@.str271 = external constant [21 x i8], align 4 ; <[21 x i8]*> [#uses=1]
@llvm.used = appending global [1 x i8*] [i8* bitcast (i32 (i32, i8**)* @main to i8*)], section "llvm.metadata" ; <[1 x i8*]*> [#uses=0]
define i32 @main(i32 %argc, i8** %argv) nounwind {
entry:
%0 = shufflevector <2 x i64> undef, <2 x i64> zeroinitializer, <2 x i32> <i32 1, i32 2> ; <<2 x i64>> [#uses=1]
store <2 x i64> %0, <2 x i64>* undef, align 16
%val4723 = load <8 x i16>* undef ; <<8 x i16>> [#uses=1]
call void @PrintShortX(i8* getelementptr inbounds ([21 x i8]* @.str271, i32 0, i32 0), <8 x i16> %val4723, i32 0) nounwind
ret i32 undef
}
declare void @PrintShortX(i8*, <8 x i16>, i32) nounwind