Codegen -0.0 correctly. Do not use fldz! This is another -0.0 == +0.0 problem, arg.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11070 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/InstSelectSimple.cpp b/lib/Target/X86/InstSelectSimple.cpp
index 5135385..fd4c44f 100644
--- a/lib/Target/X86/InstSelectSimple.cpp
+++ b/lib/Target/X86/InstSelectSimple.cpp
@@ -438,10 +438,9 @@
BMI(MBB, IP, IntegralOpcodeTab[Class], 1, R).addZImm(CI->getRawValue());
}
} else if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
- double Value = CFP->getValue();
- if (Value == +0.0)
+ if (CFP->isExactlyValue(+0.0))
BMI(MBB, IP, X86::FLD0, 0, R);
- else if (Value == +1.0)
+ else if (CFP->isExactlyValue(+1.0))
BMI(MBB, IP, X86::FLD1, 0, R);
else {
// Otherwise we need to spill the constant to memory...
@@ -1212,7 +1211,7 @@
// sub 0, X -> neg X
if (OperatorClass == 1 && Class != cLong)
- if (ConstantInt *CI = dyn_cast<ConstantInt>(Op0))
+ if (ConstantInt *CI = dyn_cast<ConstantInt>(Op0)) {
if (CI->isNullValue()) {
unsigned op1Reg = getReg(Op1, MBB, IP);
switch (Class) {
@@ -1228,6 +1227,7 @@
return;
}
}
+ }
if (!isa<ConstantInt>(Op1) || Class == cLong) {
static const unsigned OpcodeTab[][4] = {