[llvm] [RISCV][VLOPT] Add vadc to isSupportedInstr (PR #122345)

[Michael Maitland via llvm-commits]

https://github.com/michaelmaitland updated https://github.com/llvm/llvm-project/pull/122345

>From 0399987aa4df632b43e27f9a74d663d8b897034b Mon Sep 17 00:00:00 2001
From: Michael Maitland <michaeltmaitland at gmail.com>
Date: Thu, 9 Jan 2025 11:16:40 -0800
Subject: [PATCH] [RISCV][VLOPT] Add vadcto isSupportedInstr

---
 llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp   |  4 ++
 llvm/test/CodeGen/RISCV/rvv/vl-opt-instrs.ll | 60 ++++++++++++++++++++
 2 files changed, 64 insertions(+)

diff --git a/llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp b/llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp
index 9870279ad17c76..9338e0a1c8741e 100644
--- a/llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp
+++ b/llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp
@@ -948,6 +948,10 @@ static bool isSupportedInstr(const MachineInstr &MI) {
   case RISCV::VMERGE_VIM:
   case RISCV::VMERGE_VVM:
   case RISCV::VMERGE_VXM:
+  // Vector Integer Add-with-Carry / Subtract-with-Borrow Instructions
+  case RISCV::VADC_VIM:
+  case RISCV::VADC_VVM:
+  case RISCV::VADC_VXM:
   // Vector Widening Integer Multiply-Add Instructions
   case RISCV::VWMACCU_VV:
   case RISCV::VWMACCU_VX:
diff --git a/llvm/test/CodeGen/RISCV/rvv/vl-opt-instrs.ll b/llvm/test/CodeGen/RISCV/rvv/vl-opt-instrs.ll
index ce79bd5d5ddcf6..ce94e1c193645a 100644
--- a/llvm/test/CodeGen/RISCV/rvv/vl-opt-instrs.ll
+++ b/llvm/test/CodeGen/RISCV/rvv/vl-opt-instrs.ll
@@ -3596,6 +3596,66 @@ define <vscale x 4 x i32> @vmerge_vim(<vscale x 4 x i32> %a, <vscale x 4 x i1> %
   ret <vscale x 4 x i32> %2
 }
 
+define <vscale x 4 x i32> @vadc_vvm(<vscale x 4 x i32> %a, <vscale x 4 x i32> %b, <vscale x 4 x i1> %c, iXLen %vl) {
+; NOVLOPT-LABEL: vadc_vvm:
+; NOVLOPT:       # %bb.0:
+; NOVLOPT-NEXT:    vsetvli a1, zero, e32, m2, ta, ma
+; NOVLOPT-NEXT:    vadc.vvm v8, v8, v10, v0
+; NOVLOPT-NEXT:    vsetvli zero, a0, e32, m2, ta, ma
+; NOVLOPT-NEXT:    vadd.vv v8, v8, v10
+; NOVLOPT-NEXT:    ret
+;
+; VLOPT-LABEL: vadc_vvm:
+; VLOPT:       # %bb.0:
+; VLOPT-NEXT:    vsetvli zero, a0, e32, m2, ta, ma
+; VLOPT-NEXT:    vadc.vvm v8, v8, v10, v0
+; VLOPT-NEXT:    vadd.vv v8, v8, v10
+; VLOPT-NEXT:    ret
+  %1 = call <vscale x 4 x i32> @llvm.riscv.vadc.nxv4i32.nxv4i32(<vscale x 4 x i32> poison, <vscale x 4 x i32> %a, <vscale x 4 x i32> %b, <vscale x 4 x i1> %c, iXLen -1)
+  %2 = call <vscale x 4 x i32> @llvm.riscv.vadd.nxv4i32.nxv4i32(<vscale x 4 x i32> poison, <vscale x 4 x i32> %1, <vscale x 4 x i32> %b, iXLen %vl)
+  ret <vscale x 4 x i32> %2
+}
+
+define <vscale x 4 x i32> @vadc_vxm(<vscale x 4 x i32> %a, i32 %b, <vscale x 4 x i1> %c, iXLen %vl) {
+; NOVLOPT-LABEL: vadc_vxm:
+; NOVLOPT:       # %bb.0:
+; NOVLOPT-NEXT:    vsetvli a2, zero, e32, m2, ta, ma
+; NOVLOPT-NEXT:    vadc.vxm v8, v8, a0, v0
+; NOVLOPT-NEXT:    vsetvli zero, a1, e32, m2, ta, ma
+; NOVLOPT-NEXT:    vadd.vv v8, v8, v8
+; NOVLOPT-NEXT:    ret
+;
+; VLOPT-LABEL: vadc_vxm:
+; VLOPT:       # %bb.0:
+; VLOPT-NEXT:    vsetvli zero, a1, e32, m2, ta, ma
+; VLOPT-NEXT:    vadc.vxm v8, v8, a0, v0
+; VLOPT-NEXT:    vadd.vv v8, v8, v8
+; VLOPT-NEXT:    ret
+  %1 = call <vscale x 4 x i32> @llvm.riscv.vadc.nxv4i32.i32(<vscale x 4 x i32> poison, <vscale x 4 x i32> %a, i32 %b, <vscale x 4 x i1> %c, iXLen -1)
+  %2 = call <vscale x 4 x i32> @llvm.riscv.vadd.nxv4i32.nxv4i32(<vscale x 4 x i32> poison, <vscale x 4 x i32> %1, <vscale x 4 x i32> %1, iXLen %vl)
+  ret <vscale x 4 x i32> %2
+}
+
+define <vscale x 4 x i32> @vadc_vim(<vscale x 4 x i32> %a, <vscale x 4 x i1> %c, iXLen %vl) {
+; NOVLOPT-LABEL: vadc_vim:
+; NOVLOPT:       # %bb.0:
+; NOVLOPT-NEXT:    vsetvli a1, zero, e32, m2, ta, ma
+; NOVLOPT-NEXT:    vadc.vim v8, v8, 9, v0
+; NOVLOPT-NEXT:    vsetvli zero, a0, e32, m2, ta, ma
+; NOVLOPT-NEXT:    vadd.vv v8, v8, v8
+; NOVLOPT-NEXT:    ret
+;
+; VLOPT-LABEL: vadc_vim:
+; VLOPT:       # %bb.0:
+; VLOPT-NEXT:    vsetvli zero, a0, e32, m2, ta, ma
+; VLOPT-NEXT:    vadc.vim v8, v8, 9, v0
+; VLOPT-NEXT:    vadd.vv v8, v8, v8
+; VLOPT-NEXT:    ret
+  %1 = call <vscale x 4 x i32> @llvm.riscv.vadc.nxv4i32.i32(<vscale x 4 x i32> poison, <vscale x 4 x i32> %a, i32 9, <vscale x 4 x i1> %c, iXLen -1)
+  %2 = call <vscale x 4 x i32> @llvm.riscv.vadd.nxv4i32.nxv4i32(<vscale x 4 x i32> poison, <vscale x 4 x i32> %1, <vscale x 4 x i32> %1, iXLen %vl)
+  ret <vscale x 4 x i32> %2
+}
+
 define <vscale x 4 x i32> @vaadd_vv(<vscale x 4 x i32> %a, <vscale x 4 x i32> %b, iXLen %vl) {
 ; NOVLOPT-LABEL: vaadd_vv:
 ; NOVLOPT:       # %bb.0: