[X86] Extract latency of fldz/fld1 in separate classes.
Summary:
- I've measured the values for Broadwell, Haswell, SandyBridge, Skylake.
- For ZnVer1 and Atom, values were transferred form `InstRW`s.
- For SLM and BtVer2, values are from Agner.
This is split off from https://reviews.llvm.org/D47377
Reviewers: RKSimon, andreadb
Subscribers: gbedwell, llvm-commits
Differential Revision: https://reviews.llvm.org/D47523
llvm-svn: 333642
diff --git a/llvm/lib/Target/X86/X86InstrFPStack.td b/llvm/lib/Target/X86/X86InstrFPStack.td
index 0cc6272..bbfe7b2 100644
--- a/llvm/lib/Target/X86/X86InstrFPStack.td
+++ b/llvm/lib/Target/X86/X86InstrFPStack.td
@@ -564,10 +564,11 @@
[(set RFP80:$dst, fpimm1)]>;
}
-let SchedRW = [WriteZero] in {
+let SchedRW = [WriteFLD0] in
def LD_F0 : FPI<0xD9, MRM_EE, (outs), (ins), "fldz">;
+
+let SchedRW = [WriteFLD1] in
def LD_F1 : FPI<0xD9, MRM_E8, (outs), (ins), "fld1">;
-}
// Floating point compares.
let SchedRW = [WriteFCom] in {