[llvm] [InstCombine] Remove some of the complexity-based canonicalization (PR #91185)

[via llvm-commits]

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@@ -711,9 +711,9 @@ define double @sqrt_intrinsic_three_args5(double %x, double %y) {
 
 define double @sqrt_intrinsic_three_args6(double %x, double %y) {
 ; CHECK-LABEL: @sqrt_intrinsic_three_args6(
-; CHECK-NEXT:    [[FABS:%.*]] = call fast double @llvm.fabs.f64(double [[X:%.*]])
-; CHECK-NEXT:    [[SQRT1:%.*]] = call fast double @llvm.sqrt.f64(double [[Y:%.*]])
-; CHECK-NEXT:    [[SQRT:%.*]] = fmul fast double [[FABS]], [[SQRT1]]
+; CHECK-NEXT:    [[MUL:%.*]] = fmul fast double [[X:%.*]], [[X]]
+; CHECK-NEXT:    [[MUL2:%.*]] = fmul fast double [[Y:%.*]], [[MUL]]
+; CHECK-NEXT:    [[SQRT:%.*]] = call fast double @llvm.sqrt.f64(double [[MUL2]])
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goldsteinn wrote:

regression

https://github.com/llvm/llvm-project/pull/91185