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Generate ftst instructions for comparison against zero

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11098 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-02-03 18:54:04 +00:00
parent acc00bc609
commit 9f08a92e6c
2 changed files with 18 additions and 0 deletions
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9
lib/Target/X86/InstSelectSimple.cpp
View File

@ -702,6 +702,15 @@ unsigned ISel::EmitComparison(unsigned OpNum, Value *Op0, Value *Op1,
return OpNum;
}
// Special case handling of comparison against +/- 0.0
if (ConstantFP *CFP = dyn_cast<ConstantFP>(Op1))
if (CFP->isExactlyValue(+0.0) || CFP->isExactlyValue(-0.0)) {
BMI(MBB, IP, X86::FTST, 1).addReg(Op0r);
BMI(MBB, IP, X86::FNSTSWr8, 0);
BMI(MBB, IP, X86::SAHF, 1);
return OpNum;
}
unsigned Op1r = getReg(Op1, MBB, IP);
switch (Class) {
default: assert(0 && "Unknown type class!");

9
lib/Target/X86/X86ISelSimple.cpp
View File

@ -702,6 +702,15 @@ unsigned ISel::EmitComparison(unsigned OpNum, Value *Op0, Value *Op1,
return OpNum;
}
// Special case handling of comparison against +/- 0.0
if (ConstantFP *CFP = dyn_cast<ConstantFP>(Op1))
if (CFP->isExactlyValue(+0.0) || CFP->isExactlyValue(-0.0)) {
BMI(MBB, IP, X86::FTST, 1).addReg(Op0r);
BMI(MBB, IP, X86::FNSTSWr8, 0);
BMI(MBB, IP, X86::SAHF, 1);
return OpNum;
}
unsigned Op1r = getReg(Op1, MBB, IP);
switch (Class) {
default: assert(0 && "Unknown type class!");