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make sure to set Changed=true when instcombine hacks on the code,

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not doing so prevents it from properly iterating and prevents it
from deleting the entire body of dce-iterate.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63476 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-01-31 07:04:22 +00:00
parent 95be699a9a
commit 1e19d603e0
2 changed files with 33 additions and 5 deletions
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24
test/Transforms/InstCombine/dce-iterate.ll Normal file
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; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {ret double .sy}
define internal double @ScaleObjectAdd(double %sx, double %sy, double %sz) nounwind {
entry:
%sx34 = bitcast double %sx to i64 ; <i64> [#uses=1]
%sx3435 = zext i64 %sx34 to i960 ; <i960> [#uses=1]
%sy22 = bitcast double %sy to i64 ; <i64> [#uses=1]
%sy2223 = zext i64 %sy22 to i960 ; <i960> [#uses=1]
%sy222324 = shl i960 %sy2223, 320 ; <i960> [#uses=1]
%sy222324.ins = or i960 %sx3435, %sy222324 ; <i960> [#uses=1]
%sz10 = bitcast double %sz to i64 ; <i64> [#uses=1]
%sz1011 = zext i64 %sz10 to i960 ; <i960> [#uses=1]
%sz101112 = shl i960 %sz1011, 640 ; <i960> [#uses=1]
%sz101112.ins = or i960 %sy222324.ins, %sz101112
%a = trunc i960 %sz101112.ins to i64 ; <i64> [#uses=1]
%b = bitcast i64 %a to double ; <double> [#uses=1]
%c = lshr i960 %sz101112.ins, 320 ; <i960> [#uses=1]
%d = trunc i960 %c to i64 ; <i64> [#uses=1]
%e = bitcast i64 %d to double ; <double> [#uses=1]
%f = add double %b, %e
ret double %e
}