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| author | Dan Gohman <gohman@apple.com> | 2008-10-04 00:31:14 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2008-10-04 00:31:14 +0000 |
| commit | 022b21ff7c047f8c1615a6588052c55427bcd9b0 (patch) | |
| tree | 26da2035d0b767936c607a58c261ee6d5a4cdead /test/CodeGen/X86/local-liveness.ll | |
| parent | 880ae364ba4ed3d63542a2ef934980c70e8bb9d7 (diff) | |
| download | external_llvm-022b21ff7c047f8c1615a6588052c55427bcd9b0.zip external_llvm-022b21ff7c047f8c1615a6588052c55427bcd9b0.tar.gz external_llvm-022b21ff7c047f8c1615a6588052c55427bcd9b0.tar.bz2 | |
Fix a bug in the local allocator's liveness computation where it
was setting kill flags on tied uses in two-address instructions.
The kill flags were causing the allocator to think it could
allocate the use and its tied def in different registers.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57039 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/local-liveness.ll')
| -rw-r--r-- | test/CodeGen/X86/local-liveness.ll | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/test/CodeGen/X86/local-liveness.ll b/test/CodeGen/X86/local-liveness.ll new file mode 100644 index 0000000..f176ec2 --- /dev/null +++ b/test/CodeGen/X86/local-liveness.ll @@ -0,0 +1,31 @@ +; RUN: llvm-as < %s | llc -march=x86 -regalloc=local | grep {subl %eax, %esi} + +; Local regalloc shouldn't assume that both the uses of the +; sub instruction are kills, because one of them is tied +; to an output. Previously, it was allocating both inputs +; in the same register. + +define i32 @func_3() nounwind { +entry: + %retval = alloca i32 ; <i32*> [#uses=2] + %g_323 = alloca i8 ; <i8*> [#uses=2] + %p_5 = alloca i64, align 8 ; <i64*> [#uses=2] + %0 = alloca i32 ; <i32*> [#uses=2] + %"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0] + store i64 0, i64* %p_5, align 8 + store i8 1, i8* %g_323, align 1 + %1 = load i8* %g_323, align 1 ; <i8> [#uses=1] + %2 = sext i8 %1 to i64 ; <i64> [#uses=1] + %3 = load i64* %p_5, align 8 ; <i64> [#uses=1] + %4 = sub i64 %3, %2 ; <i64> [#uses=1] + %5 = icmp sge i64 %4, 0 ; <i1> [#uses=1] + %6 = zext i1 %5 to i32 ; <i32> [#uses=1] + store i32 %6, i32* %0, align 4 + %7 = load i32* %0, align 4 ; <i32> [#uses=1] + store i32 %7, i32* %retval, align 4 + br label %return + +return: ; preds = %entry + %retval1 = load i32* %retval ; <i32> [#uses=1] + ret i32 %retval1 +} |