[x86] add more tests for node-level FMF; NFC

llvm-svn: 313893

1 files changed, 45 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/X86/fmf-flags.ll b/llvm/test/CodeGen/X86/fmf-flags.ll
index f12740a11b5..50f34e8b814 100644
--- a/llvm/test/CodeGen/X86/fmf-flags.ll
+++ b/llvm/test/CodeGen/X86/fmf-flags.ll
@@ -45,3 +45,48 @@ define float @fast_fmuladd_opts(float %a , float %b , float %c) {
   %res = call fast float @llvm.fmuladd.f32(float %a, float 2.0, float %a)
   ret float %res
 }
+
+; The multiply is strict.
+
+define double @not_so_fast_mul_add(double %x) {
+; X64-LABEL: not_so_fast_mul_add:
+; X64:       # BB#0:
+; X64-NEXT:    movsd {{.*#+}} xmm1 = mem[0],zero
+; X64-NEXT:    mulsd %xmm0, %xmm1
+; X64-NEXT:    addsd %xmm1, %xmm0
+; X64-NEXT:    retq
+;
+; X86-LABEL: not_so_fast_mul_add:
+; X86:       # BB#0:
+; X86-NEXT:    fldl {{[0-9]+}}(%esp)
+; X86-NEXT:    fld %st(0)
+; X86-NEXT:    fmull {{\.LCPI.*}}
+; X86-NEXT:    faddp %st(1)
+; X86-NEXT:    retl
+  %m = fmul double %x, 4.2
+  %a = fadd fast double %m, %x
+  ret double %a
+}
+
+; The sqrt is strict.
+
+define float @not_so_fast_recip_sqrt(float %x) {
+; X64-LABEL: not_so_fast_recip_sqrt:
+; X64:       # BB#0:
+; X64-NEXT:    sqrtss %xmm0, %xmm1
+; X64-NEXT:    movss {{.*#+}} xmm0 = mem[0],zero,zero,zero
+; X64-NEXT:    divss %xmm1, %xmm0
+; X64-NEXT:    retq
+;
+; X86-LABEL: not_so_fast_recip_sqrt:
+; X86:       # BB#0:
+; X86-NEXT:    flds {{[0-9]+}}(%esp)
+; X86-NEXT:    fsqrt
+; X86-NEXT:    fld1
+; X86-NEXT:    fdivp %st(1)
+; X86-NEXT:    retl
+  %y = call float @llvm.sqrt.f32(float %x)
+  %z = fdiv fast float 1.0, %y
+  ret float %z
+}
+