[AArch64] Add test showing incorrect register usage of FMLAL. NFC

See D156296

(cherry picked from commit e012c5cfac8542eb8164bab9891ea9b355e73517)

1 files changed, 123 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/AArch64/fmlal-loreg.ll b/llvm/test/CodeGen/AArch64/fmlal-loreg.ll
new file mode 100644
index 0000000..39185d7
--- /dev/null
+++ b/llvm/test/CodeGen/AArch64/fmlal-loreg.ll
@@ -0,0 +1,123 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 2
+; RUN: llc -mtriple=aarch64 -mattr=+fp16fml -verify-machineinstrs %s -o - 2>&1 | FileCheck %s
+
+; This tests that the fmlal/fmlal2 instructions only accept lo registers for
+; the index operand, using inline asm to force the available registers.
+
+define <4 x float> @test(ptr %lhs_panel, ptr %rhs_panel, <4 x float> %a) {
+; CHECK-LABEL: test:
+; CHECK:       // %bb.0: // %entry
+; CHECK-NEXT:    fmov x8, d0
+; CHECK-NEXT:    ldr q16, [x0]
+; CHECK-NEXT:    ldr q17, [x1]
+; CHECK-NEXT:    lsr x9, x8, #32
+; CHECK-NEXT:    //APP
+; CHECK-NEXT:    nop
+; CHECK-NEXT:    //NO_APP
+; CHECK-NEXT:    mov w8, w8
+; CHECK-NEXT:    orr x8, x8, x9, lsl #32
+; CHECK-NEXT:    fmov d0, x8
+; CHECK-NEXT:    fmlal v0.4s, v17.4h, v16.h[0]
+; CHECK-NEXT:    mov v1.16b, v0.16b
+; CHECK-NEXT:    fmlal2 v1.4s, v17.4h, v16.h[0]
+; CHECK-NEXT:    fadd v0.4s, v0.4s, v1.4s
+; CHECK-NEXT:    ret
+entry:
+  %0 = load <8 x half>, ptr %lhs_panel, align 2
+  %1 = load <8 x half>, ptr %rhs_panel, align 2
+  %vecinit91 = shufflevector <8 x half> %0, <8 x half> undef, <8 x i32> zeroinitializer
+  %b = call <4 x float> asm sideeffect "nop", "=r,r,~{q0},~{q1},~{q2},~{q3},~{q4},~{q5},~{q6},~{q7}"(<4 x float> %a) nounwind
+  %vfmlal_low3.i = tail call <4 x float> @llvm.aarch64.neon.fmlal.v4f32.v8f16(<4 x float> %b, <8 x half> %1, <8 x half> %vecinit91)
+  %vfmlal_high3.i = tail call <4 x float> @llvm.aarch64.neon.fmlal2.v4f32.v8f16(<4 x float> %vfmlal_low3.i, <8 x half> %1, <8 x half> %vecinit91)
+  %z = fadd <4 x float> %vfmlal_low3.i, %vfmlal_high3.i
+  ret <4 x float> %z
+}
+
+define void @loop(ptr %out_tile, ptr %lhs_panel, ptr %rhs_panel, i32 noundef %K, i32 noundef %flags) {
+; CHECK-LABEL: loop:
+; CHECK:       // %bb.0: // %entry
+; CHECK-NEXT:    movi v0.2d, #0000000000000000
+; CHECK-NEXT:    mov w8, w3
+; CHECK-NEXT:    movi v1.2d, #0000000000000000
+; CHECK-NEXT:  .LBB1_1: // %for.body
+; CHECK-NEXT:    // =>This Inner Loop Header: Depth=1
+; CHECK-NEXT:    ldr q2, [x1], #2
+; CHECK-NEXT:    ldr q3, [x2], #2
+; CHECK-NEXT:    subs x8, x8, #1
+; CHECK-NEXT:    fmlal v0.4s, v3.4h, v2.h[0]
+; CHECK-NEXT:    fmlal2 v1.4s, v3.4h, v2.h[0]
+; CHECK-NEXT:    b.ne .LBB1_1
+; CHECK-NEXT:  // %bb.2: // %for.cond.cleanup
+; CHECK-NEXT:    stp q0, q1, [x0]
+; CHECK-NEXT:    ret
+entry:
+  %wide.trip.count = zext i32 %K to i64
+  br label %for.body
+
+for.cond.cleanup:                                 ; preds = %for.body
+  store <4 x float> %vfmlal_low3.i, ptr %out_tile, align 4
+  %add.ptr1399 = getelementptr inbounds float, ptr %out_tile, i64 4
+  store <4 x float> %vfmlal_high3.i, ptr %add.ptr1399, align 4
+  ret void
+
+for.body:                                         ; preds = %entry, %for.body
+  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
+  %acc0.01714 = phi <4 x float> [ zeroinitializer, %entry ], [ %vfmlal_low3.i, %for.body ]
+  %acc1.01713 = phi <4 x float> [ zeroinitializer, %entry ], [ %vfmlal_high3.i, %for.body ]
+  %add.ptr = getelementptr inbounds half, ptr %lhs_panel, i64 %indvars.iv
+  %0 = load <8 x half>, ptr %add.ptr, align 2
+  %add.ptr19 = getelementptr inbounds half, ptr %rhs_panel, i64 %indvars.iv
+  %1 = load <8 x half>, ptr %add.ptr19, align 2
+  %vecinit93 = shufflevector <8 x half> %0, <8 x half> undef, <8 x i32> zeroinitializer
+  %vfmlal_low3.i = tail call <4 x float> @llvm.aarch64.neon.fmlal.v4f32.v8f16(<4 x float> %acc0.01714, <8 x half> %1, <8 x half> %vecinit93)
+  %vfmlal_high3.i = tail call <4 x float> @llvm.aarch64.neon.fmlal2.v4f32.v8f16(<4 x float> %acc1.01713, <8 x half> %1, <8 x half> %vecinit93)
+  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
+  br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
+}
+
+define void @sink(ptr %out_tile, ptr %lhs_panel, ptr %rhs_panel, i32 noundef %K, i32 noundef %flags, <8 x half> noundef %lhs) {
+; CHECK-LABEL: sink:
+; CHECK:       // %bb.0: // %entry
+; CHECK-NEXT:    movi v1.2d, #0000000000000000
+; CHECK-NEXT:    mov w8, w3
+; CHECK-NEXT:    movi v2.2d, #0000000000000000
+; CHECK-NEXT:    dup v0.8h, v0.h[0]
+; CHECK-NEXT:  .LBB2_1: // %for.body
+; CHECK-NEXT:    // =>This Inner Loop Header: Depth=1
+; CHECK-NEXT:    ldr q3, [x2], #2
+; CHECK-NEXT:    subs x8, x8, #1
+; CHECK-NEXT:    fmlal v1.4s, v3.4h, v0.4h
+; CHECK-NEXT:    fmlal2 v2.4s, v3.4h, v0.4h
+; CHECK-NEXT:    b.ne .LBB2_1
+; CHECK-NEXT:  // %bb.2: // %for.cond.cleanup
+; CHECK-NEXT:    stp q1, q2, [x0]
+; CHECK-NEXT:    ret
+entry:
+  %vecinit89 = shufflevector <8 x half> %lhs, <8 x half> undef, <8 x i32> zeroinitializer
+  %wide.trip.count = zext i32 %K to i64
+  br label %for.body
+
+for.cond.cleanup:                                 ; preds = %for.body
+  store <4 x float> %vfmlal_low3.i, ptr %out_tile, align 4
+  %add.ptr1395 = getelementptr inbounds float, ptr %out_tile, i64 4
+  store <4 x float> %vfmlal_high3.i, ptr %add.ptr1395, align 4
+  ret void
+
+for.body:                                         ; preds = %entry, %for.body
+  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
+  %acc0.01702 = phi <4 x float> [ zeroinitializer, %entry ], [ %vfmlal_low3.i, %for.body ]
+  %acc1.01701 = phi <4 x float> [ zeroinitializer, %entry ], [ %vfmlal_high3.i, %for.body ]
+  %add.ptr = getelementptr inbounds half, ptr %rhs_panel, i64 %indvars.iv
+  %0 = load <8 x half>, ptr %add.ptr, align 2
+  %vfmlal_low3.i = tail call <4 x float> @llvm.aarch64.neon.fmlal.v4f32.v8f16(<4 x float> %acc0.01702, <8 x half> %0, <8 x half> %vecinit89)
+  %vfmlal_high3.i = tail call <4 x float> @llvm.aarch64.neon.fmlal2.v4f32.v8f16(<4 x float> %acc1.01701, <8 x half> %0, <8 x half> %vecinit89)
+  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
+  br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
+}
+
+
+declare <4 x float> @llvm.aarch64.neon.fmlal.v4f32.v8f16(<4 x float>, <8 x half>, <8 x half>) #2
+declare <4 x float> @llvm.aarch64.neon.fmlal2.v4f32.v8f16(<4 x float>, <8 x half>, <8 x half>) #2
+