[SPARC] Clean up the support for disabling fsmuld and fmuls instructions.

Summary:
Also enable no-fsmuld for sparcv7 (which doesn't have the
instruction).

The previous code which used a post-processing pass to do this was
unnecessary; disabling the instruction is entirely sufficient.

Reviewers: jacob_hansen, ekedaigle

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D35576

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@308661 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 38 insertions, 0 deletions

diff --git a/test/CodeGen/SPARC/disable-fsmuld-fmuls.ll b/test/CodeGen/SPARC/disable-fsmuld-fmuls.ll
new file mode 100644
index 00000000000..13207c56b24
--- /dev/null
+++ b/test/CodeGen/SPARC/disable-fsmuld-fmuls.ll
@@ -0,0 +1,38 @@
+; RUN: llc %s -march=sparc -o - | FileCheck --check-prefix=CHECK --check-prefix=DEFAULT %s
+; RUN: llc %s -march=sparc -mattr=no-fmuls -o - | FileCheck --check-prefix=CHECK --check-prefix=NO-FMULS %s
+; RUN: llc %s -march=sparc -mattr=no-fsmuld -o - | FileCheck --check-prefix=CHECK --check-prefix=NO-FSMULD %s
+; RUN: llc %s -march=sparc -mattr=no-fsmuld,no-fmuls -o - | FileCheck --check-prefix=CHECK --check-prefix=NO-BOTH %s
+
+;;; Test case ensures that the no-fsmuld and no-fmuls features disable
+;;; the relevant instruction, and alternative sequences get emitted
+;;; instead.
+
+; CHECK-LABEL: test_float_mul:
+; DEFAULT:     fmuls
+; NO-FSMULD:   fmuls
+; NO-FMULS:    fsmuld
+; NO-FMULS:    fdtos
+; NO-BOTH:     fstod
+; NO-BOTH:     fstod
+; NO-BOTH:     fmuld
+; NO-BOTH:     fdtos
+define float @test_float_mul(float %a, float %b) {
+entry:
+  %mul = fmul float %a, %b
+
+  ret float %mul
+}
+
+; CHECK-LABEL: test_float_mul_double:
+; DEFAULT:     fsmuld
+; NO-FSMULD:   fstod
+; NO-FSMULD:   fstod
+; NO-FSMULD:   fmuld
+define double @test_float_mul_double(float %a, float %b) {
+entry:
+  %a_double = fpext float %a to double
+  %b_double = fpext float %b to double
+  %mul = fmul double %a_double, %b_double
+
+  ret double %mul
+}