Generate something sensible for an [SU]ADDO op when the overflow/carry flag is
the conditional for the BRCOND statement. For instance, it will generate:
addl %eax, %ecx
jo LOF
instead of
addl %eax, %ecx
; About 10 instructions to compare the signs of LHS, RHS, and sum.
jl LOF
llvm-svn: 60123
diff --git a/llvm/lib/Target/X86/X86InstrInfo.cpp b/llvm/lib/Target/X86/X86InstrInfo.cpp
index 2e449b9..ba73f49 100644
--- a/llvm/lib/Target/X86/X86InstrInfo.cpp
+++ b/llvm/lib/Target/X86/X86InstrInfo.cpp
@@ -1382,6 +1382,8 @@
case X86::JNP: return X86::COND_NP;
case X86::JO: return X86::COND_O;
case X86::JNO: return X86::COND_NO;
+ case X86::JC: return X86::COND_C;
+ case X86::JNC: return X86::COND_NC;
}
}
@@ -1404,6 +1406,8 @@
case X86::COND_NP: return X86::JNP;
case X86::COND_O: return X86::JO;
case X86::COND_NO: return X86::JNO;
+ case X86::COND_C: return X86::JC;
+ case X86::COND_NC: return X86::JNC;
}
}
@@ -1428,6 +1432,8 @@
case X86::COND_NP: return X86::COND_P;
case X86::COND_O: return X86::COND_NO;
case X86::COND_NO: return X86::COND_O;
+ case X86::COND_C: return X86::COND_NC;
+ case X86::COND_NC: return X86::COND_C;
}
}