[llvm] [RISCV] Rework IDiv and FDiv pipes on SiFive7 (PR #73970)

[Michael Maitland via llvm-commits]

https://github.com/michaelmaitland updated https://github.com/llvm/llvm-project/pull/73970

>From 666d1f82e948b638c0931992f33352fe51597ee6 Mon Sep 17 00:00:00 2001
From: Michael Maitland <michaeltmaitland at gmail.com>
Date: Thu, 30 Nov 2023 10:58:49 -0800
Subject: [PATCH 1/2] [RISCV] Rework IDiv and FDiv pipes on SiFive7

Set BufferSize=0 and remove Super pipes for these resources.
---
 llvm/lib/Target/RISCV/RISCVSchedSiFive7.td | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Target/RISCV/RISCVSchedSiFive7.td b/llvm/lib/Target/RISCV/RISCVSchedSiFive7.td
index 53ef9d1baf7b59a..261c22ea35317e2 100644
--- a/llvm/lib/Target/RISCV/RISCVSchedSiFive7.td
+++ b/llvm/lib/Target/RISCV/RISCVSchedSiFive7.td
@@ -213,12 +213,12 @@ let SchedModel = SiFive7Model in {
 let BufferSize = 0 in {
 def SiFive7PipeA       : ProcResource<1>;
 def SiFive7PipeB       : ProcResource<1>;
+def SiFive7IDiv        : ProcResource<1> { let Super = SiFive7PipeB; } // Int Division
+def SiFive7FDiv        : ProcResource<1> { let Super = SiFive7PipeB; } // FP Division/Sqrt
 def SiFive7PipeV       : ProcResource<1>;
 }
 
 let BufferSize = 1 in {
-def SiFive7IDiv        : ProcResource<1> { let Super = SiFive7PipeB; } // Int Division
-def SiFive7FDiv        : ProcResource<1> { let Super = SiFive7PipeB; } // FP Division/Sqrt
 def SiFive7VA          : ProcResource<1> { let Super = SiFive7PipeV; } // Arithmetic sequencer
 def SiFive7VL          : ProcResource<1> { let Super = SiFive7PipeV; } // Load sequencer
 def SiFive7VS          : ProcResource<1> { let Super = SiFive7PipeV; } // Store sequencer

>From 3ce8ed8450468760298b7db0505d285f829bfbb0 Mon Sep 17 00:00:00 2001
From: Michael Maitland <michaeltmaitland at gmail.com>
Date: Fri, 1 Dec 2023 08:46:29 -0800
Subject: [PATCH 2/2] !fixup remove super

---
 llvm/lib/Target/RISCV/RISCVSchedSiFive7.td | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Target/RISCV/RISCVSchedSiFive7.td b/llvm/lib/Target/RISCV/RISCVSchedSiFive7.td
index 261c22ea35317e2..0f79b297e97c524 100644
--- a/llvm/lib/Target/RISCV/RISCVSchedSiFive7.td
+++ b/llvm/lib/Target/RISCV/RISCVSchedSiFive7.td
@@ -213,8 +213,8 @@ let SchedModel = SiFive7Model in {
 let BufferSize = 0 in {
 def SiFive7PipeA       : ProcResource<1>;
 def SiFive7PipeB       : ProcResource<1>;
-def SiFive7IDiv        : ProcResource<1> { let Super = SiFive7PipeB; } // Int Division
-def SiFive7FDiv        : ProcResource<1> { let Super = SiFive7PipeB; } // FP Division/Sqrt
+def SiFive7IDiv        : ProcResource<1>; // Int Division
+def SiFive7FDiv        : ProcResource<1>; // FP Division/Sqrt
 def SiFive7PipeV       : ProcResource<1>;
 }