[llvm] r357939 - [InstCombine] add extra-use tests for fmul+sqrt; NFC

[Sanjay Patel via llvm-commits]

Author: spatel
Date: Mon Apr  8 13:37:34 2019
New Revision: 357939

URL: http://llvm.org/viewvc/llvm-project?rev=357939&view=rev
Log:
[InstCombine] add extra-use tests for fmul+sqrt; NFC

Modified:
    llvm/trunk/test/Transforms/InstCombine/fmul-sqrt.ll

Modified: llvm/trunk/test/Transforms/InstCombine/fmul-sqrt.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/fmul-sqrt.ll?rev=357939&r1=357938&r2=357939&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/fmul-sqrt.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/fmul-sqrt.ll Mon Apr  8 13:37:34 2019
@@ -127,6 +127,36 @@ define double @sqrt_dividend_squared(dou
   ret double %squared
 }
 
+define double @sqrt_divisor_squared_extra_use(double %x, double %y) {
+; CHECK-LABEL: @sqrt_divisor_squared_extra_use(
+; CHECK-NEXT:    [[SQRT:%.*]] = call double @llvm.sqrt.f64(double [[X:%.*]])
+; CHECK-NEXT:    [[DIV:%.*]] = fdiv double [[Y:%.*]], [[SQRT]]
+; CHECK-NEXT:    call void @use(double [[DIV]])
+; CHECK-NEXT:    [[SQUARED:%.*]] = fmul reassoc nnan nsz double [[DIV]], [[DIV]]
+; CHECK-NEXT:    ret double [[SQUARED]]
+;
+  %sqrt = call double @llvm.sqrt.f64(double %x)
+  %div = fdiv double %y, %sqrt
+  call void @use(double %div)
+  %squared = fmul reassoc nnan nsz double %div, %div
+  ret double %squared
+}
+
+define double @sqrt_dividend_squared_extra_use(double %x, double %y) {
+; CHECK-LABEL: @sqrt_dividend_squared_extra_use(
+; CHECK-NEXT:    [[SQRT:%.*]] = call double @llvm.sqrt.f64(double [[X:%.*]])
+; CHECK-NEXT:    call void @use(double [[SQRT]])
+; CHECK-NEXT:    [[DIV:%.*]] = fdiv fast double [[SQRT]], [[Y:%.*]]
+; CHECK-NEXT:    [[SQUARED:%.*]] = fmul fast double [[DIV]], [[DIV]]
+; CHECK-NEXT:    ret double [[SQUARED]]
+;
+  %sqrt = call double @llvm.sqrt.f64(double %x)
+  call void @use(double %sqrt)
+  %div = fdiv fast double %sqrt, %y
+  %squared = fmul fast double %div, %div
+  ret double %squared
+}
+
 ; Negative test - require 'nsz'.
 
 define double @sqrt_divisor_not_enough_FMF(double %x, double %y) {