Lower some min/max idioms to minss/maxss when unsafe fp math is enabled.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30748 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 578e2cc..a78c698 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -5377,25 +5377,55 @@
unsigned IntNo = 0;
if (LHS == Cond.getOperand(0) && RHS == Cond.getOperand(1)) {
- // (X olt Y) ? X : Y -> min
- if (CC == ISD::SETOLT || CC == ISD::SETLT)
+ switch (CC) {
+ default: break;
+ case ISD::SETOLE: // (X <= Y) ? X : Y -> min
+ case ISD::SETULE:
+ case ISD::SETLE:
+ if (!UnsafeFPMath) break;
+ // FALL THROUGH.
+ case ISD::SETOLT: // (X olt/lt Y) ? X : Y -> min
+ case ISD::SETLT:
IntNo = LHS.getValueType() == MVT::f32 ? Intrinsic::x86_sse_min_ss :
Intrinsic::x86_sse2_min_sd;
- // (X uge Y) ? X : Y -> max
- if (CC == ISD::SETUGE || CC == ISD::SETGE)
+ break;
+
+ case ISD::SETOGT: // (X > Y) ? X : Y -> max
+ case ISD::SETUGT:
+ case ISD::SETGT:
+ if (!UnsafeFPMath) break;
+ // FALL THROUGH.
+ case ISD::SETUGE: // (X uge/ge Y) ? X : Y -> max
+ case ISD::SETGE:
IntNo = LHS.getValueType() == MVT::f32 ? Intrinsic::x86_sse_max_ss :
- Intrinsic::x86_sse2_max_sd;
- // TODO: Handle more cases if unsafe math!
+ Intrinsic::x86_sse2_max_sd;
+ break;
+ }
} else if (LHS == Cond.getOperand(1) && RHS == Cond.getOperand(0)) {
- // (X uge Y) ? Y : X -> min
- if (CC == ISD::SETUGE || CC == ISD::SETGE)
+ switch (CC) {
+ default: break;
+ case ISD::SETOGT: // (X > Y) ? Y : X -> min
+ case ISD::SETUGT:
+ case ISD::SETGT:
+ if (!UnsafeFPMath) break;
+ // FALL THROUGH.
+ case ISD::SETUGE: // (X uge/ge Y) ? Y : X -> min
+ case ISD::SETGE:
IntNo = LHS.getValueType() == MVT::f32 ? Intrinsic::x86_sse_min_ss :
- Intrinsic::x86_sse2_min_sd;
- // (X olt Y) ? Y : X -> max
- if (CC == ISD::SETOLT || CC == ISD::SETLT)
+ Intrinsic::x86_sse2_min_sd;
+ break;
+
+ case ISD::SETOLE: // (X <= Y) ? Y : X -> max
+ case ISD::SETULE:
+ case ISD::SETLE:
+ if (!UnsafeFPMath) break;
+ // FALL THROUGH.
+ case ISD::SETOLT: // (X olt/lt Y) ? Y : X -> max
+ case ISD::SETLT:
IntNo = LHS.getValueType() == MVT::f32 ? Intrinsic::x86_sse_max_ss :
- Intrinsic::x86_sse2_max_sd;
- // TODO: Handle more cases if unsafe math!
+ Intrinsic::x86_sse2_max_sd;
+ break;
+ }
}
// minss/maxss take a v4f32 operand.