[llvm] [LoongArch] Optimize inserting fp element bitconverted from integer (PR #147043)

[via llvm-commits]

https://github.com/zhaoqi5 created https://github.com/llvm/llvm-project/pull/147043

None

>From 035d395b49a88617a0b97ae7990f8da50f35f27f Mon Sep 17 00:00:00 2001
From: Qi Zhao <zhaoqi01 at loongson.cn>
Date: Tue, 1 Jul 2025 20:29:55 +0800
Subject: [PATCH] [LoongArch] Optimize inserting fp element bitconverted from
 integer

---
 llvm/lib/Target/LoongArch/LoongArchLASXInstrInfo.td          | 5 ++++-
 llvm/lib/Target/LoongArch/LoongArchLSXInstrInfo.td           | 5 ++++-
 .../LoongArch/lasx/ir-instruction/insert-bitcast-element.ll  | 4 ----
 .../LoongArch/lsx/ir-instruction/insert-bitcast-element.ll   | 4 ----
 4 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/llvm/lib/Target/LoongArch/LoongArchLASXInstrInfo.td b/llvm/lib/Target/LoongArch/LoongArchLASXInstrInfo.td
index ff7b0f2ae3f25..66476606bb3f8 100644
--- a/llvm/lib/Target/LoongArch/LoongArchLASXInstrInfo.td
+++ b/llvm/lib/Target/LoongArch/LoongArchLASXInstrInfo.td
@@ -1593,7 +1593,10 @@ def : Pat<(vector_insert v8i32:$xd, GRLenVT:$rj, uimm3:$imm),
           (XVINSGR2VR_W v8i32:$xd, GRLenVT:$rj, uimm3:$imm)>;
 def : Pat<(vector_insert v4i64:$xd, GRLenVT:$rj, uimm2:$imm),
           (XVINSGR2VR_D v4i64:$xd, GRLenVT:$rj, uimm2:$imm)>;
-
+def : Pat<(vector_insert v8f32:$vd, (loongarch_movgr2fr_w_la64 GPR:$rj), uimm3:$imm),
+          (XVINSGR2VR_W $vd, $rj, uimm3:$imm)>;
+def : Pat<(vector_insert v4f64:$vd, (f64 (bitconvert i64:$rj)), uimm2:$imm),
+          (XVINSGR2VR_D $vd, $rj, uimm2:$imm)>;
 def : Pat<(vector_insert v8f32:$vd, FPR32:$fj, uimm3:$imm),
           (XVINSGR2VR_W $vd, (COPY_TO_REGCLASS FPR32:$fj, GPR), uimm3:$imm)>;
 def : Pat<(vector_insert v4f64:$vd, FPR64:$fj, uimm2:$imm),
diff --git a/llvm/lib/Target/LoongArch/LoongArchLSXInstrInfo.td b/llvm/lib/Target/LoongArch/LoongArchLSXInstrInfo.td
index d73d78083ddcd..7bbe6fc972aaf 100644
--- a/llvm/lib/Target/LoongArch/LoongArchLSXInstrInfo.td
+++ b/llvm/lib/Target/LoongArch/LoongArchLSXInstrInfo.td
@@ -1791,7 +1791,10 @@ def : Pat<(vector_insert v4i32:$vd, GRLenVT:$rj, uimm2:$imm),
           (VINSGR2VR_W v4i32:$vd, GRLenVT:$rj, uimm2:$imm)>;
 def : Pat<(vector_insert v2i64:$vd, GRLenVT:$rj, uimm1:$imm),
           (VINSGR2VR_D v2i64:$vd, GRLenVT:$rj, uimm1:$imm)>;
-
+def : Pat<(vector_insert v4f32:$vd, (loongarch_movgr2fr_w_la64 GPR:$rj), uimm2:$imm),
+          (VINSGR2VR_W $vd, $rj, uimm2:$imm)>;
+def : Pat<(vector_insert v2f64:$vd, (f64 (bitconvert i64:$rj)), uimm1:$imm),
+          (VINSGR2VR_D $vd, $rj, uimm1:$imm)>;
 def : Pat<(vector_insert v4f32:$vd, FPR32:$fj, uimm2:$imm),
           (VINSGR2VR_W $vd, (COPY_TO_REGCLASS FPR32:$fj, GPR), uimm2:$imm)>;
 def : Pat<(vector_insert v2f64:$vd, FPR64:$fj, uimm1:$imm),
diff --git a/llvm/test/CodeGen/LoongArch/lasx/ir-instruction/insert-bitcast-element.ll b/llvm/test/CodeGen/LoongArch/lasx/ir-instruction/insert-bitcast-element.ll
index 7b2461b11f12d..b37b525981fd9 100644
--- a/llvm/test/CodeGen/LoongArch/lasx/ir-instruction/insert-bitcast-element.ll
+++ b/llvm/test/CodeGen/LoongArch/lasx/ir-instruction/insert-bitcast-element.ll
@@ -4,8 +4,6 @@
 define <8 x float> @insert_bitcast_v8f32(<8 x float> %a, i32 %b) nounwind {
 ; CHECK-LABEL: insert_bitcast_v8f32:
 ; CHECK:       # %bb.0: # %entry
-; CHECK-NEXT:    movgr2fr.w $fa1, $a0
-; CHECK-NEXT:    movfr2gr.s $a0, $fa1
 ; CHECK-NEXT:    xvinsgr2vr.w $xr0, $a0, 1
 ; CHECK-NEXT:    ret
 entry:
@@ -17,8 +15,6 @@ entry:
 define <4 x double> @insert_bitcast_v4f64(<4 x double> %a, i64 %b) nounwind {
 ; CHECK-LABEL: insert_bitcast_v4f64:
 ; CHECK:       # %bb.0: # %entry
-; CHECK-NEXT:    movgr2fr.d $fa1, $a0
-; CHECK-NEXT:    movfr2gr.d $a0, $fa1
 ; CHECK-NEXT:    xvinsgr2vr.d $xr0, $a0, 1
 ; CHECK-NEXT:    ret
 entry:
diff --git a/llvm/test/CodeGen/LoongArch/lsx/ir-instruction/insert-bitcast-element.ll b/llvm/test/CodeGen/LoongArch/lsx/ir-instruction/insert-bitcast-element.ll
index a20d17efdfb11..c42e3013c1131 100644
--- a/llvm/test/CodeGen/LoongArch/lsx/ir-instruction/insert-bitcast-element.ll
+++ b/llvm/test/CodeGen/LoongArch/lsx/ir-instruction/insert-bitcast-element.ll
@@ -4,8 +4,6 @@
 define <4 x float> @insert_bitcast_v4f32(<4 x float> %a, i32 %b) nounwind {
 ; CHECK-LABEL: insert_bitcast_v4f32:
 ; CHECK:       # %bb.0: # %entry
-; CHECK-NEXT:    movgr2fr.w $fa1, $a0
-; CHECK-NEXT:    movfr2gr.s $a0, $fa1
 ; CHECK-NEXT:    vinsgr2vr.w $vr0, $a0, 1
 ; CHECK-NEXT:    ret
 entry:
@@ -17,8 +15,6 @@ entry:
 define <2 x double> @insert_bitcast_v2f64(<2 x double> %a, i64 %b) nounwind {
 ; CHECK-LABEL: insert_bitcast_v2f64:
 ; CHECK:       # %bb.0: # %entry
-; CHECK-NEXT:    movgr2fr.d $fa1, $a0
-; CHECK-NEXT:    movfr2gr.d $a0, $fa1
 ; CHECK-NEXT:    vinsgr2vr.d $vr0, $a0, 1
 ; CHECK-NEXT:    ret
 entry: