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| author | Dan Gohman <gohman@apple.com> | 2009-04-27 02:00:55 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-04-27 02:00:55 +0000 |
| commit | c7b3444095f9aa5398d134c780e327a187cda231 (patch) | |
| tree | 4a1567e3145693dd2b1e2b880daf266b8f7b4231 /test/CodeGen/X86/fold-sext-trunc.ll | |
| parent | d6c329532bed7a60f760b3a009b3582c624bc270 (diff) | |
| download | external_llvm-c7b3444095f9aa5398d134c780e327a187cda231.zip external_llvm-c7b3444095f9aa5398d134c780e327a187cda231.tar.gz external_llvm-c7b3444095f9aa5398d134c780e327a187cda231.tar.bz2 | |
When transforming sext(trunc(load(x))) into sext(smaller load(x)),
the trunc is directly replaced with the smaller load, so don't
try to create a new sext node. This fixes PR4050.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70179 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/fold-sext-trunc.ll')
| -rw-r--r-- | test/CodeGen/X86/fold-sext-trunc.ll | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/test/CodeGen/X86/fold-sext-trunc.ll b/test/CodeGen/X86/fold-sext-trunc.ll new file mode 100644 index 0000000..1016b10 --- /dev/null +++ b/test/CodeGen/X86/fold-sext-trunc.ll @@ -0,0 +1,20 @@ +; RUN: llvm-as < %s | llc -march=x86-64 | grep movslq | count 1 +; PR4050 + + type { i64 } ; type %0 + %struct.S1 = type { i16, i32 } +@g_10 = external global %struct.S1 ; <%struct.S1*> [#uses=2] + +declare void @func_28(i64, i64) + +define void @int322(i32 %foo) nounwind { +entry: + %val = load i64* getelementptr (%0* bitcast (%struct.S1* @g_10 to %0*), i32 0, i32 0) ; <i64> [#uses=1] + %0 = load i32* getelementptr (%struct.S1* @g_10, i32 0, i32 1), align 4 ; <i32> [#uses=1] + %1 = sext i32 %0 to i64 ; <i64> [#uses=1] + %tmp4.i = lshr i64 %val, 32 ; <i64> [#uses=1] + %tmp5.i = trunc i64 %tmp4.i to i32 ; <i32> [#uses=1] + %2 = sext i32 %tmp5.i to i64 ; <i64> [#uses=1] + tail call void @func_28(i64 %2, i64 %1) nounwind + ret void +} |