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When decling to reuse existing expressions that involve casts, ignore 

bitcasts, which are really no-ops here. This fixes slowdowns on
MultiSource/Applications/aha and others.

llvm-svn: 127031
This commit is contained in:
Dan Gohman 2011-03-04 20:46:46 +00:00
parent 8c2d3f4248
commit aa036eedb8
2 changed files with 46 additions and 1 deletions
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2
llvm/lib/Analysis/ScalarEvolutionExpander.cpp
View File

@ -859,7 +859,7 @@ SCEVExpander::getAddRecExprPHILiterally(const SCEVAddRecExpr *Normalized,
// to be.
do {
if (IncV->getNumOperands() == 0 || isa<PHINode>(IncV) ||
isa<CastInst>(IncV)) {
(isa<CastInst>(IncV) && !isa<BitCastInst>(IncV))) {
IncV = 0;
break;
}

45
llvm/test/CodeGen/X86/lsr-redundant-addressing.ll Normal file
View File

@ -0,0 +1,45 @@
; RUN: llc -march=x86-64 < %s | fgrep {addq $-16,} | count 1
; rdar://9081094
; LSR shouldn't create lots of redundant address computations.
%0 = type { i32, [3 x i32] }
%1 = type { i32 (i32, i32, i32)*, i32, i32, [3 x i32], i8*, i8*, i8* }
@pgm = external hidden unnamed_addr global [5 x %0], align 32
@isa = external hidden unnamed_addr constant [13 x %1], align 32
define void @main_bb.i() nounwind {
bb:
br label %bb38
bb38: ; preds = %bb200, %bb
%tmp39 = phi i64 [ %tmp201, %bb200 ], [ 0, %bb ]
%tmp40 = sub i64 0, %tmp39
%tmp47 = getelementptr [5 x %0]* @pgm, i64 0, i64 %tmp40, i32 0
%tmp34 = load i32* %tmp47, align 16
%tmp203 = icmp slt i32 %tmp34, 12
br i1 %tmp203, label %bb215, label %bb200
bb200: ; preds = %bb38
%tmp201 = add i64 %tmp39, 1
br label %bb38
bb215: ; preds = %bb38
%tmp50 = getelementptr [5 x %0]* @pgm, i64 0, i64 %tmp40, i32 1, i64 2
%tmp49 = getelementptr [5 x %0]* @pgm, i64 0, i64 %tmp40, i32 1, i64 1
%tmp48 = getelementptr [5 x %0]* @pgm, i64 0, i64 %tmp40, i32 1, i64 0
%tmp216 = add nsw i32 %tmp34, 1
store i32 %tmp216, i32* %tmp47, align 16
%tmp217 = sext i32 %tmp216 to i64
%tmp218 = getelementptr inbounds [13 x %1]* @isa, i64 0, i64 %tmp217, i32 3, i64 0
%tmp219 = load i32* %tmp218, align 8
store i32 %tmp219, i32* %tmp48, align 4
%tmp220 = getelementptr inbounds [13 x %1]* @isa, i64 0, i64 %tmp217, i32 3, i64 1
%tmp221 = load i32* %tmp220, align 4
store i32 %tmp221, i32* %tmp49, align 4
%tmp222 = getelementptr inbounds [13 x %1]* @isa, i64 0, i64 %tmp217, i32 3, i64 2
%tmp223 = load i32* %tmp222, align 8
store i32 %tmp223, i32* %tmp50, align 4
ret void
}