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| author | Craig Topper <craig.topper@gmail.com> | 2013-01-03 06:40:20 +0000 |
|---|---|---|
| committer | Craig Topper <craig.topper@gmail.com> | 2013-01-03 06:40:20 +0000 |
| commit | 56bc0ab09591b0dec6fcc65f8816b7c4764a0c6c (patch) | |
| tree | 6da4dc591398be2ad9440b76abb8a6f06b845f6a /lib/Target/X86/X86InstrArithmetic.td | |
| parent | be76df6ce69ea1a4b6306af6fc06ccada708256d (diff) | |
| download | llvm-56bc0ab09591b0dec6fcc65f8816b7c4764a0c6c.tar.gz llvm-56bc0ab09591b0dec6fcc65f8816b7c4764a0c6c.tar.bz2 llvm-56bc0ab09591b0dec6fcc65f8816b7c4764a0c6c.tar.xz | |
Mark DIV/IDIV instructions hasSideEffects=1 because they can trap when dividing by 0. This is needed to keep early if conversion from moving them across basic blocks.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171461 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/X86InstrArithmetic.td')
| -rw-r--r-- | lib/Target/X86/X86InstrArithmetic.td | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Target/X86/X86InstrArithmetic.td b/lib/Target/X86/X86InstrArithmetic.td index d56763ea9d..3540fc3125 100644 --- a/lib/Target/X86/X86InstrArithmetic.td +++ b/lib/Target/X86/X86InstrArithmetic.td @@ -266,7 +266,7 @@ def IMUL64rmi8 : RIi8<0x6B, MRMSrcMem, // GR64 = [mem64]*I8 // unsigned division/remainder -let hasSideEffects = 0 in { +let hasSideEffects = 1 in { // so that we don't speculatively execute let Defs = [AL,EFLAGS,AX], Uses = [AX] in def DIV8r : I<0xF6, MRM6r, (outs), (ins GR8:$src), // AX/r8 = AL,AH "div{b}\t$src", [], IIC_DIV8_REG>; |