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Fix SCEV overly optimistic back edge taken count for multi-exit loops.

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Fixes PR11375: Different results for 'clang++ huh.cpp'...


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144746 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2011-11-16 00:52:40 +00:00
parent f56c60b571
commit 79f0bfcc20
4 changed files with 75 additions and 11 deletions
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8
test/Transforms/IndVarSimplify/loop_evaluate10.ll
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@@ -1,8 +1,14 @@
; RUN: opt < %s -indvars -S \
; RUN: | grep {%b.1 = phi i32 \\\[ 2, %bb \\\], \\\[ 1, %bb2 \\\]}
;
; This loop has multiple exits, and the value of %b1 depends on which
; exit is taken. Indvars should correctly compute the exit values.
;
; XFAIL: *
; Indvars does not currently replace loop invariant values unless all
; loop exits have the same exit value. We could handle some cases,
; such as this, by making getSCEVAtScope() sensitive to a particular
; loop exit. See PR11388.
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
target triple = "x86_64-pc-linux-gnu"