[NFC][Test] Add three tests to verify the behavior of a*b-c*d if there is multi-uses

1 files changed, 67 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/PowerPC/fma-precision.ll b/llvm/test/CodeGen/PowerPC/fma-precision.ll
index 24c304d26e5f..7f832d8bf4ff 100644
--- a/llvm/test/CodeGen/PowerPC/fma-precision.ll
+++ b/llvm/test/CodeGen/PowerPC/fma-precision.ll
@@ -97,3 +97,70 @@ entry:
   %add = fadd fast double %mul1, %mul
   ret double %add
 }
+
+define double @fma_multi_uses1(double %a, double %b, double %c, double %d, double* %p1, double* %p2, double* %p3) {
+; CHECK-LABEL: fma_multi_uses1:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    xsmuldp 5, 1, 2
+; CHECK-NEXT:    xsmuldp 0, 3, 4
+; CHECK-NEXT:    stfd 5, 0(7)
+; CHECK-NEXT:    stfd 5, 0(8)
+; CHECK-NEXT:    stfd 0, 0(9)
+; CHECK-NEXT:    xsmsubadp 0, 1, 2
+; CHECK-NEXT:    fmr 1, 0
+; CHECK-NEXT:    blr
+  %ab = fmul fast double %a, %b
+  %cd = fmul fast double %c, %d
+  store double %ab, double* %p1 ; extra use of %ab
+  store double %ab, double* %p2 ; another extra use of %ab
+  store double %cd, double* %p3 ; extra use of %cd
+  %r = fsub fast double %ab, %cd
+  ret double %r
+}
+
+define double @fma_multi_uses2(double %a, double %b, double %c, double %d, double* %p1, double* %p2, double* %p3) {
+; CHECK-LABEL: fma_multi_uses2:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    xsmuldp 5, 1, 2
+; CHECK-NEXT:    xsmuldp 0, 3, 4
+; CHECK-NEXT:    stfd 5, 0(7)
+; CHECK-NEXT:    stfd 0, 0(8)
+; CHECK-NEXT:    stfd 0, 0(9)
+; CHECK-NEXT:    xsmsubadp 0, 1, 2
+; CHECK-NEXT:    fmr 1, 0
+; CHECK-NEXT:    blr
+  %ab = fmul fast double %a, %b
+  %cd = fmul fast double %c, %d
+  store double %ab, double* %p1 ; extra use of %ab
+  store double %cd, double* %p2 ; extra use of %cd
+  store double %cd, double* %p3 ; another extra use of %cd
+  %r = fsub fast double %ab, %cd
+  ret double %r
+}
+
+define double @fma_multi_uses3(double %a, double %b, double %c, double %d, double %f, double %g, double* %p1, double* %p2, double* %p3) {
+; CHECK-LABEL: fma_multi_uses3:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    xsmuldp 0, 1, 2
+; CHECK-NEXT:    xsmuldp 3, 3, 4
+; CHECK-NEXT:    ld 3, 96(1)
+; CHECK-NEXT:    stfd 0, 0(9)
+; CHECK-NEXT:    stfd 0, 0(10)
+; CHECK-NEXT:    fmr 0, 3
+; CHECK-NEXT:    xsmsubadp 3, 1, 2
+; CHECK-NEXT:    xsmsubadp 0, 5, 6
+; CHECK-NEXT:    xsmuldp 4, 5, 6
+; CHECK-NEXT:    stfd 4, 0(3)
+; CHECK-NEXT:    xsadddp 1, 3, 0
+; CHECK-NEXT:    blr
+  %ab = fmul fast double %a, %b
+  %cd = fmul fast double %c, %d
+  %fg = fmul fast double %f, %g
+  store double %ab, double* %p1 ; extra use of %ab
+  store double %ab, double* %p2 ; another extra use of %ab
+  store double %fg, double* %p3 ; extra use of %fg
+  %q = fsub fast double %fg, %cd ; The uses of %cd reduce to 1 after %r is folded. 2 uses of %fg, fold %cd, remove def of %cd
+  %r = fsub fast double %ab, %cd ; Fold %r before %q. 3 uses of %ab, 2 uses of %cd, fold %cd
+  %add = fadd fast double %r, %q
+  ret double %add
+}