[InstCombine] add more tests for fmul+fdiv+sqrt; NFC

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@357816 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/InstCombine/fmul-sqrt.ll b/test/Transforms/InstCombine/fmul-sqrt.ll
index 8161e311ffd8e92ebc24fc5d4a937d80c96422a0..62e57cdc3e19c028042d84be9b765338e00f7ca5 100644 (file)
--- a/test/Transforms/InstCombine/fmul-sqrt.ll
+++ b/test/Transforms/InstCombine/fmul-sqrt.ll
@@ -88,8 +88,8 @@ define double @sqrt_a_sqrt_b_sqrt_c_sqrt_d_reassoc(double %a, double %b, double
   ret double %mul2
 }
 
-define double @sqrt_squared(double %x) {
-; CHECK-LABEL: @sqrt_squared(
+define double @rsqrt_squared(double %x) {
+; CHECK-LABEL: @rsqrt_squared(
 ; CHECK-NEXT:    [[SQRT:%.*]] = call fast double @llvm.sqrt.f64(double [[X:%.*]])
 ; CHECK-NEXT:    [[RSQRT:%.*]] = fdiv fast double 1.000000e+00, [[SQRT]]
 ; CHECK-NEXT:    [[SQUARED:%.*]] = fmul fast double [[RSQRT]], [[RSQRT]]
@@ -101,6 +101,47 @@ define double @sqrt_squared(double %x) {
   ret double %squared
 }
 
+define double @sqrt_divisor_squared(double %x, double %y) {
+; CHECK-LABEL: @sqrt_divisor_squared(
+; CHECK-NEXT:    [[SQRT:%.*]] = call double @llvm.sqrt.f64(double [[X:%.*]])
+; CHECK-NEXT:    [[DIV:%.*]] = fdiv double [[Y:%.*]], [[SQRT]]
+; 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
+  %squared = fmul reassoc nnan nsz double %div, %div
+  ret double %squared
+}
+
+define double @sqrt_dividend_squared(double %x, double %y) {
+; CHECK-LABEL: @sqrt_dividend_squared(
+; CHECK-NEXT:    [[SQRT:%.*]] = call double @llvm.sqrt.f64(double [[X:%.*]])
+; 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)
+  %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) {
+; CHECK-LABEL: @sqrt_divisor_not_enough_FMF(
+; CHECK-NEXT:    [[SQRT:%.*]] = call double @llvm.sqrt.f64(double [[X:%.*]])
+; CHECK-NEXT:    [[DIV:%.*]] = fdiv double [[Y:%.*]], [[SQRT]]
+; CHECK-NEXT:    [[SQUARED:%.*]] = fmul reassoc nnan double [[DIV]], [[DIV]]
+; CHECK-NEXT:    ret double [[SQUARED]]
+;
+  %sqrt = call double @llvm.sqrt.f64(double %x)
+  %div = fdiv double %y, %sqrt
+  %squared = fmul reassoc nnan double %div, %div
+  ret double %squared
+}
+
 define double @sqrt_squared_extra_use(double %x) {
 ; CHECK-LABEL: @sqrt_squared_extra_use(
 ; CHECK-NEXT:    [[SQRT:%.*]] = call fast double @llvm.sqrt.f64(double [[X:%.*]])