[llvm] [LoongArch][NFC] Pre-commit tests for shufflevector reversing within subvectors (PR #170621)

[via llvm-commits]

https://github.com/zhaoqi5 created https://github.com/llvm/llvm-project/pull/170621

None

>From 00d92d17f7a681b416654b660e7b6241a3116089 Mon Sep 17 00:00:00 2001
From: Qi Zhao <zhaoqi01 at loongson.cn>
Date: Thu, 4 Dec 2025 15:31:32 +0800
Subject: [PATCH] [LoongArch][NFC] Pre-commit tests for shufflevector reversing
 within subvectors

---
 .../LoongArch/lasx/shuffle-as-bswap.ll        | 47 +++++++++++++++++++
 .../CodeGen/LoongArch/lsx/shuffle-as-bswap.ll | 47 +++++++++++++++++++
 2 files changed, 94 insertions(+)
 create mode 100644 llvm/test/CodeGen/LoongArch/lasx/shuffle-as-bswap.ll
 create mode 100644 llvm/test/CodeGen/LoongArch/lsx/shuffle-as-bswap.ll

diff --git a/llvm/test/CodeGen/LoongArch/lasx/shuffle-as-bswap.ll b/llvm/test/CodeGen/LoongArch/lasx/shuffle-as-bswap.ll
new file mode 100644
index 0000000000000..1c9038af1d676
--- /dev/null
+++ b/llvm/test/CodeGen/LoongArch/lasx/shuffle-as-bswap.ll
@@ -0,0 +1,47 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
+; RUN: llc --mtriple=loongarch32 --mattr=+32s,+lasx < %s | FileCheck %s
+; RUN: llc --mtriple=loongarch64 --mattr=+lasx %s -o - | FileCheck %s
+
+define void @shufflevector_bswap_h(ptr %res, ptr %a) nounwind {
+; CHECK-LABEL: shufflevector_bswap_h:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xvld $xr0, $a1, 0
+; CHECK-NEXT:    xvshuf4i.b $xr0, $xr0, 177
+; CHECK-NEXT:    xvst $xr0, $a0, 0
+; CHECK-NEXT:    ret
+entry:
+  %va = load <32 x i8>, ptr %a
+  %b = shufflevector <32 x i8> %va, <32 x i8> poison, <32 x i32> <i32 1, i32 0, i32 3, i32 2, i32 5, i32 4, i32 7, i32 6, i32 9, i32 8, i32 11, i32 10, i32 13, i32 12, i32 15, i32 14, i32 17, i32 16, i32 19, i32 18, i32 21, i32 20, i32 23, i32 22, i32 25, i32 24, i32 27, i32 26, i32 29, i32 28, i32 31, i32 30>
+  store <32 x i8> %b, ptr %res
+  ret void
+}
+
+define void @shufflevector_bswap_w(ptr %res, ptr %a) nounwind {
+; CHECK-LABEL: shufflevector_bswap_w:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xvld $xr0, $a1, 0
+; CHECK-NEXT:    xvshuf4i.b $xr0, $xr0, 27
+; CHECK-NEXT:    xvst $xr0, $a0, 0
+; CHECK-NEXT:    ret
+entry:
+  %va = load <32 x i8>, ptr %a
+  %b = shufflevector <32 x i8> %va, <32 x i8> poison, <32 x i32> <i32 3, i32 2, i32 1, i32 0, i32 7, i32 6, i32 5, i32 4, i32 11, i32 10, i32 9, i32 8, i32 15, i32 14, i32 13, i32 12, i32 19, i32 18, i32 17, i32 16, i32 23, i32 22, i32 21, i32 20, i32 27, i32 26, i32 25, i32 24, i32 31, i32 30, i32 29, i32 28>
+  store <32 x i8> %b, ptr %res
+  ret void
+}
+
+define void @shufflevector_bswap_d(ptr %res, ptr %a) nounwind {
+; CHECK-LABEL: shufflevector_bswap_d:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    xvld $xr0, $a1, 0
+; CHECK-NEXT:    pcalau12i $a1, %pc_hi20(.LCPI2_0)
+; CHECK-NEXT:    xvld $xr1, $a1, %pc_lo12(.LCPI2_0)
+; CHECK-NEXT:    xvshuf.b $xr0, $xr0, $xr0, $xr1
+; CHECK-NEXT:    xvst $xr0, $a0, 0
+; CHECK-NEXT:    ret
+entry:
+  %va = load <32 x i8>, ptr %a
+  %b = shufflevector <32 x i8> %va, <32 x i8> poison, <32 x i32> <i32 7, i32 6, i32 5, i32 4, i32 3, i32 2, i32 1, i32 0, i32 15, i32 14, i32 13, i32 12, i32 11, i32 10, i32 9, i32 8, i32 23, i32 22, i32 21, i32 20, i32 19, i32 18, i32 17, i32 16, i32 31, i32 30, i32 29, i32 28, i32 27, i32 26, i32 25, i32 24>
+  store <32 x i8> %b, ptr %res
+  ret void
+}
diff --git a/llvm/test/CodeGen/LoongArch/lsx/shuffle-as-bswap.ll b/llvm/test/CodeGen/LoongArch/lsx/shuffle-as-bswap.ll
new file mode 100644
index 0000000000000..a6b61dc5a250e
--- /dev/null
+++ b/llvm/test/CodeGen/LoongArch/lsx/shuffle-as-bswap.ll
@@ -0,0 +1,47 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
+; RUN: llc --mtriple=loongarch32 --mattr=+32s,+lsx < %s | FileCheck %s
+; RUN: llc --mtriple=loongarch64 --mattr=+lsx %s -o - | FileCheck %s
+
+define void @shufflevector_bswap_h(ptr %res, ptr %a) nounwind {
+; CHECK-LABEL: shufflevector_bswap_h:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    vld $vr0, $a1, 0
+; CHECK-NEXT:    vshuf4i.b $vr0, $vr0, 177
+; CHECK-NEXT:    vst $vr0, $a0, 0
+; CHECK-NEXT:    ret
+entry:
+  %va = load <16 x i8>, ptr %a
+  %b = shufflevector <16 x i8> %va, <16 x i8> poison, <16 x i32> <i32 1, i32 0, i32 3, i32 2, i32 5, i32 4, i32 7, i32 6, i32 9, i32 8, i32 11, i32 10, i32 13, i32 12, i32 15, i32 14>
+  store <16 x i8> %b, ptr %res
+  ret void
+}
+
+define void @shufflevector_bswap_w(ptr %res, ptr %a) nounwind {
+; CHECK-LABEL: shufflevector_bswap_w:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    vld $vr0, $a1, 0
+; CHECK-NEXT:    vshuf4i.b $vr0, $vr0, 27
+; CHECK-NEXT:    vst $vr0, $a0, 0
+; CHECK-NEXT:    ret
+entry:
+  %va = load <16 x i8>, ptr %a
+  %b = shufflevector <16 x i8> %va, <16 x i8> poison, <16 x i32> <i32 3, i32 2, i32 1, i32 0, i32 7, i32 6, i32 5, i32 4, i32 11, i32 10, i32 9, i32 8, i32 15, i32 14, i32 13, i32 12>
+  store <16 x i8> %b, ptr %res
+  ret void
+}
+
+define void @shufflevector_bswap_d(ptr %res, ptr %a) nounwind {
+; CHECK-LABEL: shufflevector_bswap_d:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    vld $vr0, $a1, 0
+; CHECK-NEXT:    pcalau12i $a1, %pc_hi20(.LCPI2_0)
+; CHECK-NEXT:    vld $vr1, $a1, %pc_lo12(.LCPI2_0)
+; CHECK-NEXT:    vshuf.b $vr0, $vr0, $vr0, $vr1
+; CHECK-NEXT:    vst $vr0, $a0, 0
+; CHECK-NEXT:    ret
+entry:
+  %va = load <16 x i8>, ptr %a
+  %b = shufflevector <16 x i8> %va, <16 x i8> poison, <16 x i32> <i32 7, i32 6, i32 5, i32 4, i32 3, i32 2, i32 1, i32 0, i32 15, i32 14, i32 13, i32 12, i32 11, i32 10, i32 9, i32 8>
+  store <16 x i8> %b, ptr %res
+  ret void
+}