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| author | Evan Cheng <evan.cheng@apple.com> | 2009-05-30 08:43:27 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2009-05-30 08:43:27 +0000 |
| commit | 5f76113870a1a7e853d5618ae25eeea3afc0851f (patch) | |
| tree | 5b5d6a7e4aa32c3f29faba0ed5f74eac1ae9329c | |
| parent | 29aaef84400cb8c822c5cb4477c05b39eaab36ed (diff) | |
| download | external_llvm-5f76113870a1a7e853d5618ae25eeea3afc0851f.zip external_llvm-5f76113870a1a7e853d5618ae25eeea3afc0851f.tar.gz external_llvm-5f76113870a1a7e853d5618ae25eeea3afc0851f.tar.bz2 | |
(i64 (zext (srl GR32 8))) -> movzbl AH is not safe since srl 8 only clear the top 8 bits.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72618 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/X86/X86Instr64bit.td | 7 | ||||
| -rw-r--r-- | test/CodeGen/X86/2009-05-30-ISelBug.ll | 28 |
2 files changed, 28 insertions, 7 deletions
diff --git a/lib/Target/X86/X86Instr64bit.td b/lib/Target/X86/X86Instr64bit.td index f58ba8d..0babaa4 100644 --- a/lib/Target/X86/X86Instr64bit.td +++ b/lib/Target/X86/X86Instr64bit.td @@ -1607,13 +1607,6 @@ def : Pat<(and (srl_su GR32:$src, (i8 8)), (i32 255)), (EXTRACT_SUBREG (COPY_TO_REGCLASS GR32:$src, GR32_ABCD), x86_subreg_8bit_hi))>, Requires<[In64BitMode]>; -def : Pat<(i64 (zext (srl_su GR32:$src, (i8 8)))), - (SUBREG_TO_REG - (i64 0), - (MOVZX32_NOREXrr8 - (EXTRACT_SUBREG (COPY_TO_REGCLASS GR32:$src, GR32_ABCD), - x86_subreg_8bit_hi)), - x86_subreg_32bit)>; def : Pat<(srl_su GR16:$src, (i8 8)), (EXTRACT_SUBREG (MOVZX32_NOREXrr8 diff --git a/test/CodeGen/X86/2009-05-30-ISelBug.ll b/test/CodeGen/X86/2009-05-30-ISelBug.ll new file mode 100644 index 0000000..373f91f --- /dev/null +++ b/test/CodeGen/X86/2009-05-30-ISelBug.ll @@ -0,0 +1,28 @@ +; RUN: llvm-as < %s | llc -march=x86-64 | not grep {movzbl %\[abcd\]h,} + +define void @BZ2_bzDecompress_bb5_2E_outer_bb35_2E_i_bb54_2E_i(i32*, i32 %c_nblock_used.2.i, i32 %.reload51, i32* %.out, i32* %.out1, i32* %.out2, i32* %.out3) nounwind { +newFuncRoot: + br label %bb54.i + +bb35.i.backedge.exitStub: ; preds = %bb54.i + store i32 %6, i32* %.out + store i32 %10, i32* %.out1 + store i32 %11, i32* %.out2 + store i32 %12, i32* %.out3 + ret void + +bb54.i: ; preds = %newFuncRoot + %1 = zext i32 %.reload51 to i64 ; <i64> [#uses=1] + %2 = getelementptr i32* %0, i64 %1 ; <i32*> [#uses=1] + %3 = load i32* %2, align 4 ; <i32> [#uses=2] + %4 = lshr i32 %3, 8 ; <i32> [#uses=1] + %5 = and i32 %3, 255 ; <i32> [#uses=1] + %6 = add i32 %5, 4 ; <i32> [#uses=1] + %7 = zext i32 %4 to i64 ; <i64> [#uses=1] + %8 = getelementptr i32* %0, i64 %7 ; <i32*> [#uses=1] + %9 = load i32* %8, align 4 ; <i32> [#uses=2] + %10 = and i32 %9, 255 ; <i32> [#uses=1] + %11 = lshr i32 %9, 8 ; <i32> [#uses=1] + %12 = add i32 %c_nblock_used.2.i, 5 ; <i32> [#uses=1] + br label %bb35.i.backedge.exitStub +} |