test/codegen: add tests of FMA for arm/arm64

This CL adds tests of fused multiplication-accumulation
on arm/arm64.

Change-Id: Ic85d5277c0d6acb7e1e723653372dfaf96824a39
Reviewed-on: https://go-review.googlesource.com/c/141652
Run-TryBot: Ben Shi <powerman1st@163.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

diff --git a/test/codegen/floats.go b/test/codegen/floats.go
index 4e4f87d574a297d7b14445c7060ef38e5c80dffb..847959c42ea074f281d726b81886df7190d5307e 100644 (file)
--- a/test/codegen/floats.go
+++ b/test/codegen/floats.go
@@ -72,27 +72,43 @@ func indexStore(b0 []float64, b1 float64, idx int) {
 func FusedAdd32(x, y, z float32) float32 {
        // s390x:"FMADDS\t"
        // ppc64le:"FMADDS\t"
+       // arm/7:"MULAF"
+       // arm64:"FMADDS"
        return x*y + z
 }
 
-func FusedSub32(x, y, z float32) float32 {
+func FusedSub32_a(x, y, z float32) float32 {
        // s390x:"FMSUBS\t"
        // ppc64le:"FMSUBS\t"
        return x*y - z
 }
 
+func FusedSub32_b(x, y, z float32) float32 {
+       // arm/7:"MULSF"
+       // arm64:"FMSUBS"
+       return z - x*y
+}
+
 func FusedAdd64(x, y, z float64) float64 {
        // s390x:"FMADD\t"
        // ppc64le:"FMADD\t"
+       // arm/7:"MULAD"
+       // arm64:"FMADDD"
        return x*y + z
 }
 
-func FusedSub64(x, y, z float64) float64 {
+func FusedSub64_a(x, y, z float64) float64 {
        // s390x:"FMSUB\t"
        // ppc64le:"FMSUB\t"
        return x*y - z
 }
 
+func FusedSub64_b(x, y, z float64) float64 {
+       // arm/7:"MULSD"
+       // arm64:"FMSUBD"
+       return z - x*y
+}
+
 // ---------------- //
 //    Non-floats    //
 // ---------------- //