| Issue |
175552
|
| Summary |
[InstCombine][X86] simplifyX86FPMaxMin - allow NegZero for single operand
|
| Labels |
good first issue,
backend:X86,
llvm:instcombine
|
| Assignees |
|
| Reporter |
RKSimon
|
Follow up to #173270 and #175162
In cases where both operands are +/- 0.0f, SSE max/min instructions always return the second operand, meaning we can slightly relax the fpclass forbidden masks on a per-operand basis:
* for converting to maxnum cases we only forbid -0.0f (fcNegZero) in the second operand
* for converting to minnum cases we only forbid -0.0f (fcNegZero) in the first operand
CC @phoebewang in case I've missed something
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