[llvm] r363291 - [InstCombine] add test for failed libfunction prototype matching; NFC

[Sanjay Patel via llvm-commits]

Author: spatel
Date: Thu Jun 13 11:26:10 2019
New Revision: 363291

URL: http://llvm.org/viewvc/llvm-project?rev=363291&view=rev
Log:
[InstCombine] add test for failed libfunction prototype matching; NFC

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

Modified: llvm/trunk/test/Transforms/InstCombine/sqrt-nofast.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/sqrt-nofast.ll?rev=363291&r1=363290&r2=363291&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/sqrt-nofast.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/sqrt-nofast.ll Thu Jun 13 11:26:10 2019
@@ -1,8 +1,16 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt < %s -instcombine -S | FileCheck %s
+
 ; Check that we skip transformations if the attribute unsafe-fp-math
 ; is not set.
-; RUN: opt < %s -instcombine -S | FileCheck %s
 
 define float @mysqrt(float %x, float %y) #0 {
+; CHECK-LABEL: @mysqrt(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[MUL:%.*]] = fmul fast float [[X:%.*]], [[X]]
+; CHECK-NEXT:    [[TMP0:%.*]] = call float @llvm.sqrt.f32(float [[MUL]])
+; CHECK-NEXT:    ret float [[TMP0]]
+;
 entry:
   %x.addr = alloca float, align 4
   %y.addr = alloca float, align 4
@@ -17,9 +25,19 @@ entry:
 
 declare float @llvm.sqrt.f32(float) #1
 
-; CHECK: define float @mysqrt(float %x, float %y) {
-; CHECK: entry:
-; CHECK:   %mul = fmul fast float %x, %x
-; CHECK:   %0 = call float @llvm.sqrt.f32(float %mul)
-; CHECK:   ret float %0
-; CHECK: }
+; FIXME:
+; This is a function called "sqrtf", but its type is double.
+; Assume it is a user function rather than a libm function,
+; so don't transform it.
+
+define double @fake_sqrt(double %a, double %b) {
+; CHECK-LABEL: @fake_sqrt(
+; CHECK-NEXT:    [[FABS:%.*]] = call fast double @llvm.fabs.f64(double [[A:%.*]])
+; CHECK-NEXT:    ret double [[FABS]]
+;
+  %c = fmul fast double %a, %a
+  %e = call fast double @sqrtf(double %c) readnone
+  ret double %e
+}
+
+declare double @sqrtf(double) readnone ; This is not the 'sqrt' you're looking for.