[PATCH] D86801: [InstCombine] add extra-use tests for fmul+sqrt; NFC

[Venkataramanan Kumar via Phabricator via llvm-commits]

venkataramanan.kumar.llvm updated this revision to Diff 288794.
venkataramanan.kumar.llvm added a comment.

Added comment in the test case.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D86801/new/

https://reviews.llvm.org/D86801

Files:
  llvm/test/Transforms/InstCombine/fmul-sqrt.ll


Index: llvm/test/Transforms/InstCombine/fmul-sqrt.ll
===================================================================
--- llvm/test/Transforms/InstCombine/fmul-sqrt.ll
+++ llvm/test/Transforms/InstCombine/fmul-sqrt.ll
@@ -99,6 +99,38 @@
   ret double %squared
 }
 
+define double @rsqrt_x_reassociate_extra_use(double %x, double * %p) {
+; CHECK-LABEL: @rsqrt_x_reassociate_extra_use(
+; CHECK-NEXT:    [[SQRT:%.*]] = call fast double @llvm.sqrt.f64(double [[X:%.*]])
+; CHECK-NEXT:    [[RSQRT:%.*]] = fdiv fast double 1.000000e+00, [[SQRT]]
+; CHECK-NEXT:    [[RES:%.*]] = fmul reassoc double [[RSQRT]], [[X:%.*]]
+; CHECK-NEXT:    store double [[RSQRT]], double* %p
+; CHECK-NEXT:    ret double [[RES]]
+;
+  %sqrt = call fast double @llvm.sqrt.f64(double %x)
+  %rsqrt = fdiv fast double 1.0, %sqrt
+  %res = fmul reassoc double %rsqrt, %x
+  store double %rsqrt, double* %p
+  ret double %res
+}
+
+define double @x_add_y_rsqrt_reassociate_extra_use(double %x, double %y,  double * %p) {
+; CHECK-LABEL: @x_add_y_rsqrt_reassociate_extra_use(
+; CHECK-NEXT:    [[ADD:%.*]] = fadd fast double %x, %y
+; CHECK-NEXT:    [[SQRT:%.*]] = call fast double @llvm.sqrt.f64(double [[ADD]])
+; CHECK-NEXT:    [[RSQRT:%.*]] = fdiv fast double 1.000000e+00, [[SQRT]]
+; CHECK-NEXT:    [[RES:%.*]] = fmul reassoc double [[ADD]], [[RSQRT]]
+; CHECK-NEXT:    store double [[RSQRT]], double* %p
+; CHECK-NEXT:    ret double [[RES]]
+;
+  %add = fadd fast double %x, %y ; thwart complexity-based canonicalization
+  %sqrt = call fast double @llvm.sqrt.f64(double %add)
+  %rsqrt = fdiv fast double 1.0, %sqrt
+  %res = fmul reassoc double %add, %rsqrt
+  store double %rsqrt, double* %p
+  ret double %res
+}
+
 define double @sqrt_divisor_squared(double %x, double %y) {
 ; CHECK-LABEL: @sqrt_divisor_squared(
 ; CHECK-NEXT:    [[TMP1:%.*]] = fmul reassoc nnan nsz double [[Y:%.*]], [[Y]]


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