[llvm] [AArch64][ARM] Avoid some APFloat copies in tablegen patterns. NFC. (PR #114416)

[Simon Pilgrim via llvm-commits]

https://github.com/RKSimon updated https://github.com/llvm/llvm-project/pull/114416

>From b207bfbe81667f4e4634a370a67c982223823544 Mon Sep 17 00:00:00 2001
From: Simon Pilgrim <llvm-dev at redking.me.uk>
Date: Thu, 31 Oct 2024 15:29:41 +0000
Subject: [PATCH] [AArch64][ARM] Avoid some APFloat copies in tablegen
 patterns. NFC.

Either the N->getValueAPF() was being unused or we were failing to make use of it returning a const APFloat&
---
 .../lib/Target/AArch64/AArch64InstrFormats.td | 16 ++++++---------
 llvm/lib/Target/ARM/ARMInstrVFP.td            | 20 ++++++++-----------
 2 files changed, 14 insertions(+), 22 deletions(-)

diff --git a/llvm/lib/Target/AArch64/AArch64InstrFormats.td b/llvm/lib/Target/AArch64/AArch64InstrFormats.td
index 837d737b28588c..e44caef686be29 100644
--- a/llvm/lib/Target/AArch64/AArch64InstrFormats.td
+++ b/llvm/lib/Target/AArch64/AArch64InstrFormats.td
@@ -1390,15 +1390,13 @@ def arith_uxtx : ComplexPattern<i64, 2, "SelectArithUXTXRegister", []>;
 // Floating-point immediate.
 
 def fpimm16XForm : SDNodeXForm<fpimm, [{
-      APFloat InVal = N->getValueAPF();
-      uint32_t enc = AArch64_AM::getFP16Imm(InVal);
-      return CurDAG->getTargetConstant(enc, SDLoc(N), MVT::i32);
+      uint32_t Enc = AArch64_AM::getFP16Imm(N->getValueAPF());
+      return CurDAG->getTargetConstant(Enc, SDLoc(N), MVT::i32);
     }]>;
 
 def fpimm32XForm : SDNodeXForm<fpimm, [{
-      APFloat InVal = N->getValueAPF();
-      uint32_t enc = AArch64_AM::getFP32Imm(InVal);
-      return CurDAG->getTargetConstant(enc, SDLoc(N), MVT::i32);
+      uint32_t Enc = AArch64_AM::getFP32Imm(N->getValueAPF());
+      return CurDAG->getTargetConstant(Enc, SDLoc(N), MVT::i32);
     }]>;
 
 def fpimm32SIMDModImmType4XForm : SDNodeXForm<fpimm, [{
@@ -1409,9 +1407,8 @@ def fpimm32SIMDModImmType4XForm : SDNodeXForm<fpimm, [{
     }]>;
 
 def fpimm64XForm : SDNodeXForm<fpimm, [{
-      APFloat InVal = N->getValueAPF();
-      uint32_t enc = AArch64_AM::getFP64Imm(InVal);
-      return CurDAG->getTargetConstant(enc, SDLoc(N), MVT::i32);
+      uint32_t Enc = AArch64_AM::getFP64Imm(N->getValueAPF());
+      return CurDAG->getTargetConstant(Enc, SDLoc(N), MVT::i32);
     }]>;
 
 def fpimm16 : Operand<f16>,
@@ -1681,7 +1678,6 @@ def simdimmtype10 : Operand<i32>,
       return AArch64_AM::isAdvSIMDModImmType10(
                  Imm.bitcastToAPInt().getZExtValue());
     }], SDNodeXForm<fpimm, [{
-      APFloat InVal = N->getValueAPF();
       uint32_t enc = AArch64_AM::encodeAdvSIMDModImmType10(N->getValueAPF()
                                                            .bitcastToAPInt()
                                                            .getZExtValue());
diff --git a/llvm/lib/Target/ARM/ARMInstrVFP.td b/llvm/lib/Target/ARM/ARMInstrVFP.td
index 3094a4db2b4d12..8d35e0794e98e9 100644
--- a/llvm/lib/Target/ARM/ARMInstrVFP.td
+++ b/llvm/lib/Target/ARM/ARMInstrVFP.td
@@ -46,18 +46,16 @@ def vfp_f16imm : Operand<f16>,
                  PatLeaf<(f16 fpimm), [{
       return ARM_AM::getFP16Imm(N->getValueAPF()) != -1;
     }], SDNodeXForm<fpimm, [{
-      APFloat InVal = N->getValueAPF();
-      uint32_t enc = ARM_AM::getFP16Imm(InVal);
-      return CurDAG->getTargetConstant(enc, SDLoc(N), MVT::i32);
+      uint32_t Enc = ARM_AM::getFP16Imm(N->getValueAPF());
+      return CurDAG->getTargetConstant(Enc, SDLoc(N), MVT::i32);
     }]>> {
   let PrintMethod = "printFPImmOperand";
   let ParserMatchClass = FPImmOperand;
 }
 
 def vfp_f32f16imm_xform : SDNodeXForm<fpimm, [{
-      APFloat InVal = N->getValueAPF();
-      uint32_t enc = ARM_AM::getFP32FP16Imm(InVal);
-      return CurDAG->getTargetConstant(enc, SDLoc(N), MVT::i32);
+      uint32_t Enc = ARM_AM::getFP32FP16Imm(N->getValueAPF());
+      return CurDAG->getTargetConstant(Enc, SDLoc(N), MVT::i32);
     }]>;
 
 def vfp_f32f16imm : PatLeaf<(f32 fpimm), [{
@@ -65,9 +63,8 @@ def vfp_f32f16imm : PatLeaf<(f32 fpimm), [{
     }], vfp_f32f16imm_xform>;
 
 def vfp_f32imm_xform : SDNodeXForm<fpimm, [{
-      APFloat InVal = N->getValueAPF();
-      uint32_t enc = ARM_AM::getFP32Imm(InVal);
-      return CurDAG->getTargetConstant(enc, SDLoc(N), MVT::i32);
+      uint32_t Enc = ARM_AM::getFP32Imm(N->getValueAPF());
+      return CurDAG->getTargetConstant(Enc, SDLoc(N), MVT::i32);
     }]>;
 
 def gi_vfp_f32imm : GICustomOperandRenderer<"renderVFPF32Imm">,
@@ -88,9 +85,8 @@ def vfp_f32imm : Operand<f32>,
 }
 
 def vfp_f64imm_xform : SDNodeXForm<fpimm, [{
-      APFloat InVal = N->getValueAPF();
-      uint32_t enc = ARM_AM::getFP64Imm(InVal);
-      return CurDAG->getTargetConstant(enc, SDLoc(N), MVT::i32);
+      uint32_t Enc = ARM_AM::getFP64Imm(N->getValueAPF());
+      return CurDAG->getTargetConstant(Enc, SDLoc(N), MVT::i32);
     }]>;
 
 def gi_vfp_f64imm : GICustomOperandRenderer<"renderVFPF64Imm">,