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Teach SCEVExpander to avoid creating over-indexed GEP indices when

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possible. For example, it now emits

  %p.2.ip.1 = getelementptr [3 x [3 x double]]* %p, i64 2, i64 %tmp, i64 1

instead of the equivalent but less obvious

  %p.2.ip.1 = getelementptr [3 x [3 x double]]* %p, i64 0, i64 %tmp, i64 19


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72452 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-05-27 02:00:53 +00:00
parent 72776d2190
commit 4a4f767235
2 changed files with 44 additions and 10 deletions
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test/Transforms/IndVarSimplify/preserve-gep-remainder.ll
+19
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@@ -0,0 +1,19 @@
; RUN: llvm-as < %s | opt -indvars | llvm-dis \
; RUN: | grep {\[%\]p.2.ip.1 = getelementptr \\\[3 x \\\[3 x double\\\]\\\]\\* \[%\]p, i64 2, i64 \[%\]tmp, i64 1}
; Indvars shouldn't expand this to
; %p.2.ip.1 = getelementptr [3 x [3 x double]]* %p, i64 0, i64 %tmp, i64 19
; or something. That's valid, but more obscure.
define void @foo([3 x [3 x double]]* noalias %p) nounwind {
entry:
br label %loop
loop:
%i = phi i64 [ 0, %entry ], [ %i.next, %loop ]
%ip = add i64 %i, 1
%p.2.ip.1 = getelementptr [3 x [3 x double]]* %p, i64 2, i64 %ip, i64 1
volatile store double 0.0, double* %p.2.ip.1
%i.next = add i64 %i, 1
br label %loop
}