[VE] Change to expand FMA

[kaz7]

Summary

VE has fused multiply-add instruction for only vector calculations. This
patch forces to expand scalar FMA to multiply and add instructions.
This patch also adds regression test.

[efocht]

LGTM

llvm/lib/Target/VE/VEISelLowering.cpp

void VETargetLowering::initSPUActions() {
 
   /// Floating-point math functions {
 
   // VE doesn't have following floating point math functions.
   for (MVT VT : MVT::fp_valuetypes()) {
     setOperationAction(ISD::FABS, VT, Expand);
     setOperationAction(ISD::FCOPYSIGN, VT, Expand);
     setOperationAction(ISD::FCOS, VT, Expand);
+    setOperationAction(ISD::FMA, VT, Expand);
     setOperationAction(ISD::FSIN, VT, Expand);
     setOperationAction(ISD::FSQRT, VT, Expand);
   }
 
   /// } Floating-point math functions
 
   /// Atomic instructions {
 

llvm/test/CodeGen/VE/Scalar/fma.ll

+; RUN: llc < %s -mtriple=ve | FileCheck %s
+
+;;; Test ‘llvm.fma.*’ intrinsic
+;;;
+;;; Syntax:
+;;;   This is an overloaded intrinsic. You can use llvm.fma on any
+;;;   floating-point or vector of floating-point type. Not all targets
+;;;   support all types however.
+;;;
+;;; declare float     @llvm.fma.f32(float  %a, float  %b, float  %c)
+;;; declare double    @llvm.fma.f64(double %a, double %b, double %c)
+;;; declare x86_fp80  @llvm.fma.f80(x86_fp80 %a, x86_fp80 %b, x86_fp80 %c)
+;;; declare fp128     @llvm.fma.f128(fp128 %a, fp128 %b, fp128 %c)
+;;; declare ppc_fp128 @llvm.fma.ppcf128(ppc_fp128 %a, ppc_fp128 %b,
+;;;                                     ppc_fp128 %c)
+;;;
+;;; Overview:
+;;;   The ‘llvm.fma.*’ intrinsics perform the fused multiply-add operation.
+;;;
+;;; Arguments:
+;;;   The arguments and return value are floating-point numbers of the same
+;;;   type.
+;;;
+;;; Semantics:
+;;;   Return the same value as a corresponding libm ‘fma’ function but without
+;;;   trapping or setting errno.
+;;;
+;;;   When specified with the fast-math-flag ‘afn’, the result may be
+;;;   approximated using a less accurate calculation.
+;;;
+;;; Note:
+;;;   We test only float/double/fp128.
+
+; Function Attrs: mustprogress nofree nosync nounwind readnone willreturn
+define float @fma_float_var(float noundef %0, float noundef %1, float noundef %2) {
+; CHECK-LABEL: fma_float_var:
+; CHECK:       .LBB{{[0-9]+}}_2:
+; CHECK-NEXT:    lea %s3, fmaf@lo
+; CHECK-NEXT:    and %s3, %s3, (32)0
+; CHECK-NEXT:    lea.sl %s12, fmaf@hi(, %s3)
+; CHECK-NEXT:    bsic %s10, (, %s12)
+; CHECK-NEXT:    or %s11, 0, %s9
+  %4 = tail call fast float @llvm.fma.f32(float %0, float %1, float %2)
+  ret float %4
+}
+
+; Function Attrs: mustprogress nocallback nofree nosync nounwind readnone speculatable willreturn
+declare float @llvm.fma.f32(float, float, float)
+
+; Function Attrs: mustprogress nofree nosync nounwind readnone willreturn
+define double @fma_double_var(double noundef %0, double noundef %1, double noundef %2) {
+; CHECK-LABEL: fma_double_var:
+; CHECK:       .LBB{{[0-9]+}}_2:
+; CHECK-NEXT:    lea %s3, fma@lo
+; CHECK-NEXT:    and %s3, %s3, (32)0
+; CHECK-NEXT:    lea.sl %s12, fma@hi(, %s3)
+; CHECK-NEXT:    bsic %s10, (, %s12)
+; CHECK-NEXT:    or %s11, 0, %s9
+  %4 = tail call fast double @llvm.fma.f64(double %0, double %1, double %2)
+  ret double %4
+}
+
+; Function Attrs: mustprogress nocallback nofree nosync nounwind readnone speculatable willreturn
+declare double @llvm.fma.f64(double, double, double)
+
+; Function Attrs: mustprogress nofree nosync nounwind readnone willreturn
+define fp128 @fma_quad_var(fp128 noundef %0, fp128 noundef %1, fp128 noundef %2) {
+; CHECK-LABEL: fma_quad_var:
+; CHECK:       .LBB{{[0-9]+}}_2:
+; CHECK-NEXT:    lea %s6, fmal@lo
+; CHECK-NEXT:    and %s6, %s6, (32)0
+; CHECK-NEXT:    lea.sl %s12, fmal@hi(, %s6)
+; CHECK-NEXT:    bsic %s10, (, %s12)
+; CHECK-NEXT:    or %s11, 0, %s9
+  %4 = tail call fast fp128 @llvm.fma.f128(fp128 %0, fp128 %1, fp128 %2)
+  ret fp128 %4
+}
+
+; Function Attrs: mustprogress nocallback nofree nosync nounwind readnone speculatable willreturn
+declare fp128 @llvm.fma.f128(fp128, fp128, fp128)
+
+; Function Attrs: mustprogress nofree norecurse nosync nounwind readnone willreturn
+define float @fma_float_fore_zero(float noundef %0, float noundef returned %1) {
+; CHECK-LABEL: fma_float_fore_zero:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    or %s0, 0, %s1
+; CHECK-NEXT:    b.l.t (, %s10)
+  ret float %1
+}
+
+; Function Attrs: mustprogress nofree norecurse nosync nounwind readnone willreturn
+define double @fma_double_fore_zero(double noundef %0, double noundef returned %1) {
+; CHECK-LABEL: fma_double_fore_zero:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    or %s0, 0, %s1
+; CHECK-NEXT:    b.l.t (, %s10)
+  ret double %1
+}
+
+; Function Attrs: mustprogress nofree norecurse nosync nounwind readnone willreturn
+define fp128 @fma_quad_fore_zero(fp128 noundef %0, fp128 noundef returned %1) {
+; CHECK-LABEL: fma_quad_fore_zero:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    or %s0, 0, %s2
+; CHECK-NEXT:    or %s1, 0, %s3
+; CHECK-NEXT:    b.l.t (, %s10)
+  ret fp128 %1
+}
+
+; Function Attrs: mustprogress nofree norecurse nosync nounwind readnone willreturn
+define float @fma_float_back_zero(float noundef %0, float noundef returned %1) {
+; CHECK-LABEL: fma_float_back_zero:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    or %s0, 0, %s1
+; CHECK-NEXT:    b.l.t (, %s10)
+  ret float %1
+}
+
+; Function Attrs: mustprogress nofree norecurse nosync nounwind readnone willreturn
+define double @fma_double_back_zero(double noundef %0, double noundef returned %1) {
+; CHECK-LABEL: fma_double_back_zero:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    or %s0, 0, %s1
+; CHECK-NEXT:    b.l.t (, %s10)
+  ret double %1
+}
+
+; Function Attrs: mustprogress nofree norecurse nosync nounwind readnone willreturn
+define fp128 @fma_quad_back_zero(fp128 noundef %0, fp128 noundef returned %1) {
+; CHECK-LABEL: fma_quad_back_zero:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    or %s0, 0, %s2
+; CHECK-NEXT:    or %s1, 0, %s3
+; CHECK-NEXT:    b.l.t (, %s10)
+  ret fp128 %1
+}
+
+; Function Attrs: mustprogress nofree nosync nounwind readnone willreturn
+define float @fma_float_fore_const(float noundef %0, float noundef %1) {
+; CHECK-LABEL: fma_float_fore_const:
+; CHECK:       .LBB{{[0-9]+}}_2:
+; CHECK-NEXT:    or %s2, 0, %s1
+; CHECK-NEXT:    lea %s1, fmaf@lo
+; CHECK-NEXT:    and %s1, %s1, (32)0
+; CHECK-NEXT:    lea.sl %s12, fmaf@hi(, %s1)
+; CHECK-NEXT:    lea.sl %s1, -1073741824
+; CHECK-NEXT:    bsic %s10, (, %s12)
+; CHECK-NEXT:    or %s11, 0, %s9
+  %3 = tail call fast float @llvm.fma.f32(float %0, float -2.000000e+00, float %1)
+  ret float %3
+}
+
+; Function Attrs: mustprogress nofree nosync nounwind readnone willreturn
+define double @fma_double_fore_const(double noundef %0, double noundef %1) {
+; CHECK-LABEL: fma_double_fore_const:
+; CHECK:       .LBB{{[0-9]+}}_2:
+; CHECK-NEXT:    or %s2, 0, %s1
+; CHECK-NEXT:    lea %s1, fma@lo
+; CHECK-NEXT:    and %s1, %s1, (32)0
+; CHECK-NEXT:    lea.sl %s12, fma@hi(, %s1)
+; CHECK-NEXT:    lea.sl %s1, -1073741824
+; CHECK-NEXT:    bsic %s10, (, %s12)
+; CHECK-NEXT:    or %s11, 0, %s9
+  %3 = tail call fast double @llvm.fma.f64(double %0, double -2.000000e+00, double %1)
+  ret double %3
+}
+
+; Function Attrs: mustprogress nofree nosync nounwind readnone willreturn
+define fp128 @fma_quad_fore_const(fp128 noundef %0, fp128 noundef %1) {
+; CHECK-LABEL: fma_quad_fore_const:
+; CHECK:       .LBB{{[0-9]+}}_2:
+; CHECK-NEXT:    or %s4, 0, %s2
+; CHECK-NEXT:    or %s5, 0, %s3
+; CHECK-NEXT:    lea %s2, .LCPI{{[0-9]+}}_0@lo
+; CHECK-NEXT:    and %s2, %s2, (32)0
+; CHECK-NEXT:    lea.sl %s6, .LCPI{{[0-9]+}}_0@hi(, %s2)
+; CHECK-NEXT:    ld %s2, 8(, %s6)
+; CHECK-NEXT:    ld %s3, (, %s6)
+; CHECK-NEXT:    lea %s6, fmal@lo
+; CHECK-NEXT:    and %s6, %s6, (32)0
+; CHECK-NEXT:    lea.sl %s12, fmal@hi(, %s6)
+; CHECK-NEXT:    bsic %s10, (, %s12)
+; CHECK-NEXT:    or %s11, 0, %s9
+  %3 = tail call fast fp128 @llvm.fma.f128(fp128 %0, fp128 0xL0000000000000000C000000000000000, fp128 %1)
+  ret fp128 %3
+}
+
+; Function Attrs: mustprogress nofree nosync nounwind readnone willreturn
+define float @fma_float_back_const(float noundef %0, float noundef %1) {
+; CHECK-LABEL: fma_float_back_const:
+; CHECK:       .LBB{{[0-9]+}}_2:
+; CHECK-NEXT:    or %s2, 0, %s1
+; CHECK-NEXT:    lea %s1, fmaf@lo
+; CHECK-NEXT:    and %s1, %s1, (32)0
+; CHECK-NEXT:    lea.sl %s12, fmaf@hi(, %s1)
+; CHECK-NEXT:    lea.sl %s1, -1073741824
+; CHECK-NEXT:    bsic %s10, (, %s12)
+; CHECK-NEXT:    or %s11, 0, %s9
+  %3 = tail call fast float @llvm.fma.f32(float %0, float -2.000000e+00, float %1)
+  ret float %3
+}
+
+; Function Attrs: mustprogress nofree nosync nounwind readnone willreturn
+define double @fma_double_back_const(double noundef %0, double noundef %1) {
+; CHECK-LABEL: fma_double_back_const:
+; CHECK:       .LBB{{[0-9]+}}_2:
+; CHECK-NEXT:    or %s2, 0, %s1
+; CHECK-NEXT:    lea %s1, fma@lo
+; CHECK-NEXT:    and %s1, %s1, (32)0
+; CHECK-NEXT:    lea.sl %s12, fma@hi(, %s1)
+; CHECK-NEXT:    lea.sl %s1, -1073741824
+; CHECK-NEXT:    bsic %s10, (, %s12)
+; CHECK-NEXT:    or %s11, 0, %s9
+  %3 = tail call fast double @llvm.fma.f64(double %0, double -2.000000e+00, double %1)
+  ret double %3
+}
+
+; Function Attrs: mustprogress nofree nosync nounwind readnone willreturn
+define fp128 @fma_quad_back_const(fp128 noundef %0, fp128 noundef %1) {
+; CHECK-LABEL: fma_quad_back_const:
+; CHECK:       .LBB{{[0-9]+}}_2:
+; CHECK-NEXT:    or %s4, 0, %s2
+; CHECK-NEXT:    or %s5, 0, %s3
+; CHECK-NEXT:    lea %s2, .LCPI{{[0-9]+}}_0@lo
+; CHECK-NEXT:    and %s2, %s2, (32)0
+; CHECK-NEXT:    lea.sl %s6, .LCPI{{[0-9]+}}_0@hi(, %s2)
+; CHECK-NEXT:    ld %s2, 8(, %s6)
+; CHECK-NEXT:    ld %s3, (, %s6)
+; CHECK-NEXT:    lea %s6, fmal@lo
+; CHECK-NEXT:    and %s6, %s6, (32)0
+; CHECK-NEXT:    lea.sl %s12, fmal@hi(, %s6)
+; CHECK-NEXT:    bsic %s10, (, %s12)
+; CHECK-NEXT:    or %s11, 0, %s9
+  %3 = tail call fast fp128 @llvm.fma.f128(fp128 %0, fp128 0xL0000000000000000C000000000000000, fp128 %1)
+  ret fp128 %3
+}