[llvm] [RISCV] Use policy instead of ForceTailAgnostic for vmsbf/vmsif/vmsof pseudos. (PR #127535)

[Craig Topper via llvm-commits]

https://github.com/topperc created https://github.com/llvm/llvm-project/pull/127535

ForceTailAgnostic is currently treated as an override of the policy operand. It doesn't do anything else so we can just use the policy directly.

I'm going to see about removing the only other use of ForceTailAgnostic by adding a policy operand to those pseudos.

>From 8ecddf3bbc31152ba0be77385e0dd2010dc8779e Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper at sifive.com>
Date: Mon, 17 Feb 2025 10:27:15 -0800
Subject: [PATCH] [RISCV] Use policy instead of ForceTailAgnostic for
 vmsbf/vmsif/vmsof pseudos.

ForceTailAgnostic is currently treated as an override of the policy
operand. It doesn't do anything else so we can just use the policy
directly.

I'm going to see about removing the only other use of ForceTailAgnostic
by adding a policy operand to those pseudos.
---
 llvm/lib/Target/RISCV/RISCVInstrInfoVPseudos.td | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfoVPseudos.td b/llvm/lib/Target/RISCV/RISCVInstrInfoVPseudos.td
index 77f41e3c202c7..33c04d1c05613 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoVPseudos.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoVPseudos.td
@@ -122,6 +122,7 @@ def DecImm : SDNodeXForm<imm, [{
 
 defvar TAIL_AGNOSTIC = 1;
 defvar TU_MU = 0;
+defvar TA_MU = 1;
 defvar TA_MA = 3;
 
 //===----------------------------------------------------------------------===//
@@ -2029,7 +2030,6 @@ multiclass VPseudoVSFS_M {
       def "_M_" # mti.BX : VPseudoUnaryNoMaskNoPolicy<VR, VR, constraint>,
                            SchedUnary<"WriteVMSFSV", "ReadVMSFSV", mx,
                                       forcePassthruRead=true>;
-      let ForceTailAgnostic = true in
       def "_M_" # mti.BX # "_MASK" : VPseudoUnaryMask<VR, VR, constraint,
                                                       sewop = sew_mask>,
                                      SchedUnary<"WriteVMSFSV", "ReadVMSFSV", mx,
@@ -4019,7 +4019,7 @@ class VPatMaskUnaryMask<string intrinsic_name,
                 (!cast<Instruction>(inst#"_M_"#mti.BX#"_MASK")
                 (mti.Mask VR:$passthru),
                 (mti.Mask VR:$rs2),
-                (mti.Mask VMV0:$vm), GPR:$vl, mti.Log2SEW, TU_MU)>;
+                (mti.Mask VMV0:$vm), GPR:$vl, mti.Log2SEW, TA_MU)>;
 
 class VPatUnaryAnyMask<string intrinsic,
                        string inst,