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| author | Evan Cheng <evan.cheng@apple.com> | 2008-09-29 17:26:18 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2008-09-29 17:26:18 +0000 |
| commit | d47e0b664f9c4546e26cc527deca145fe37634fa (patch) | |
| tree | 9743f0f752c89b8e42f883545e4dbc363f620e64 /lib/Target/X86 | |
| parent | 6cccf03d02936e16319e7cebf7a158643a8b1040 (diff) | |
| download | external_llvm-d47e0b664f9c4546e26cc527deca145fe37634fa.zip external_llvm-d47e0b664f9c4546e26cc527deca145fe37634fa.tar.gz external_llvm-d47e0b664f9c4546e26cc527deca145fe37634fa.tar.bz2 | |
Fix PR2835. Do not change the width of a volatile load.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56792 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86')
| -rw-r--r-- | lib/Target/X86/X86InstrInfo.td | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/lib/Target/X86/X86InstrInfo.td b/lib/Target/X86/X86InstrInfo.td index 11ea1c0..ee60b9f 100644 --- a/lib/Target/X86/X86InstrInfo.td +++ b/lib/Target/X86/X86InstrInfo.td @@ -266,6 +266,20 @@ def loadi32 : PatFrag<(ops node:$ptr), (i32 (ld node:$ptr)), [{ return false; }]>; +def nvloadi32 : PatFrag<(ops node:$ptr), (i32 (ld node:$ptr)), [{ + LoadSDNode *LD = cast<LoadSDNode>(N); + if (LD->isVolatile()) + return false; + if (LD->getAddressingMode() != ISD::UNINDEXED) + return false; + ISD::LoadExtType ExtType = LD->getExtensionType(); + if (ExtType == ISD::NON_EXTLOAD) + return true; + if (ExtType == ISD::EXTLOAD) + return LD->getAlignment() >= 4; + return false; +}]>; + def loadi8 : PatFrag<(ops node:$ptr), (i8 (load node:$ptr))>; def loadi64 : PatFrag<(ops node:$ptr), (i64 (load node:$ptr))>; @@ -2812,8 +2826,10 @@ def : Pat<(i32 (anyext GR16:$src)), (INSERT_SUBREG (i32 (IMPLICIT_DEF)), GR16:$src, x86_subreg_16bit)>; // (and (i32 load), 255) -> (zextload i8) -def : Pat<(i32 (and (loadi32 addr:$src), (i32 255))), (MOVZX32rm8 addr:$src)>; -def : Pat<(i32 (and (loadi32 addr:$src), (i32 65535))),(MOVZX32rm16 addr:$src)>; +def : Pat<(i32 (and (nvloadi32 addr:$src), (i32 255))), + (MOVZX32rm8 addr:$src)>; +def : Pat<(i32 (and (nvloadi32 addr:$src), (i32 65535))), + (MOVZX32rm16 addr:$src)>; //===----------------------------------------------------------------------===// // Some peepholes |