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| author | Chris Lattner <sabre@nondot.org> | 2008-04-29 17:28:22 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2008-04-29 17:28:22 +0000 |
| commit | 40700fe6836c808789d1fe5cc6bcccce86d5c62b (patch) | |
| tree | 71ca04c759392cd1ad096f0cd22dc0136bbad30f /test/Transforms/InstCombine/2008-04-29-VolatileLoadDontMerge.ll | |
| parent | 68608e4dd0a7b48f1d1270c34e538bf5922336ac (diff) | |
| download | external_llvm-40700fe6836c808789d1fe5cc6bcccce86d5c62b.zip external_llvm-40700fe6836c808789d1fe5cc6bcccce86d5c62b.tar.gz external_llvm-40700fe6836c808789d1fe5cc6bcccce86d5c62b.tar.bz2 | |
don't eliminate load from volatile value on paths where the load is dead.
This fixes the second half of PR2262
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50430 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/InstCombine/2008-04-29-VolatileLoadDontMerge.ll')
| -rw-r--r-- | test/Transforms/InstCombine/2008-04-29-VolatileLoadDontMerge.ll | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/2008-04-29-VolatileLoadDontMerge.ll b/test/Transforms/InstCombine/2008-04-29-VolatileLoadDontMerge.ll new file mode 100644 index 0000000..e43c22d --- /dev/null +++ b/test/Transforms/InstCombine/2008-04-29-VolatileLoadDontMerge.ll @@ -0,0 +1,25 @@ +; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep {volatile load} | count 2 +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-darwin8" +@g_1 = internal global i32 0 ; <i32*> [#uses=3] + +define i32 @main() nounwind { +entry: + %tmp93 = icmp slt i32 0, 10 ; <i1> [#uses=0] + %tmp34 = volatile load i32* @g_1, align 4 ; <i32> [#uses=1] + br label %bb + +bb: ; preds = %bb, %entry + %b.0.reg2mem.0 = phi i32 [ 0, %entry ], [ %tmp6, %bb ] ; <i32> [#uses=1] + %tmp3.reg2mem.0 = phi i32 [ %tmp34, %entry ], [ %tmp3, %bb ] ; <i32> [#uses=1] + %tmp4 = add i32 %tmp3.reg2mem.0, 5 ; <i32> [#uses=1] + volatile store i32 %tmp4, i32* @g_1, align 4 + %tmp6 = add i32 %b.0.reg2mem.0, 1 ; <i32> [#uses=2] + %tmp9 = icmp slt i32 %tmp6, 10 ; <i1> [#uses=1] + %tmp3 = volatile load i32* @g_1, align 4 ; <i32> [#uses=1] + br i1 %tmp9, label %bb, label %bb11 + +bb11: ; preds = %bb + ret i32 0 +} + |