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author | Dan Gohman <gohman@apple.com> | 2009-08-25 17:42:10 +0000 |
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committer | Dan Gohman <gohman@apple.com> | 2009-08-25 17:42:10 +0000 |
commit | 76f497a351c562f366b5e93c27d3f1652fb48ff4 (patch) | |
tree | d812d214bfb03590f07bf1b62066c62707577fe6 /test/Transforms/IndVarSimplify/sink-alloca.ll | |
parent | 613bf1ef018514e88f64f5e60f126096963248f3 (diff) | |
download | external_llvm-76f497a351c562f366b5e93c27d3f1652fb48ff4.zip external_llvm-76f497a351c562f366b5e93c27d3f1652fb48ff4.tar.gz external_llvm-76f497a351c562f366b5e93c27d3f1652fb48ff4.tar.bz2 |
Special-case static allocas in IndVarSimplify's loop invariant
sinking code, since they are special. If the loop preheader happens
to be the entry block of a function, don't sink static allocas
out of it. This fixes PR4775.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80010 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/IndVarSimplify/sink-alloca.ll')
-rw-r--r-- | test/Transforms/IndVarSimplify/sink-alloca.ll | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/test/Transforms/IndVarSimplify/sink-alloca.ll b/test/Transforms/IndVarSimplify/sink-alloca.ll new file mode 100644 index 0000000..f5378cc --- /dev/null +++ b/test/Transforms/IndVarSimplify/sink-alloca.ll @@ -0,0 +1,31 @@ +; RUN: llvm-as < %s | opt -indvars | llvm-dis | FileCheck %s +; PR4775 + +; Indvars shouldn't sink the alloca out of the entry block, even though +; it's not used until after the loop. + +target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128" +target triple = "i386-apple-darwin10.0" + +@llvm.used = appending global [1 x i8*] [i8* bitcast (i32 ()* @main to i8*)], +section "llvm.metadata" ; <[1 x i8*]*> [#uses=0] + +define i32 @main() nounwind { +; CHECK: entry: +; CHECK-NEXT: %result.i = alloca i32, align 4 +entry: + %result.i = alloca i32, align 4 ; <i32*> [#uses=2] + br label %while.cond + +while.cond: ; preds = %while.cond, %entry + %call = call i32 @bar() nounwind ; <i32> [#uses=1] + %tobool = icmp eq i32 %call, 0 ; <i1> [#uses=1] + br i1 %tobool, label %while.end, label %while.cond + +while.end: ; preds = %while.cond + volatile store i32 0, i32* %result.i + %tmp.i = volatile load i32* %result.i ; <i32> [#uses=0] + ret i32 0 +} + +declare i32 @bar() |