Enable exp10 libcall on linux

Author: Krishna-13-cyber

llvm/lib/Analysis/TargetLibraryInfo.cpp

@@ -562,12 +562,9 @@ static void initialize(TargetLibraryInfoImpl &TLI, const Triple &T,
     // or we have a reasonable detection strategy, we cannot use exp10 reliably
     // on Linux.
     //
-    // Fall through to disable all of them.
-    [[fallthrough]];
-  default:
-    TLI.setUnavailable(LibFunc_exp10);
-    TLI.setUnavailable(LibFunc_exp10f);
-    TLI.setUnavailable(LibFunc_exp10l);
+    TLI.setAvailableWithName(LibFunc_exp10, "__exp10");
+    TLI.setAvailableWithName(LibFunc_exp10f, "__exp10f");
+    break;
   }
 
   // ffsl is available on at least Darwin, Mac OS X, iOS, FreeBSD, and
@@ -834,6 +831,9 @@ static void initialize(TargetLibraryInfoImpl &TLI, const Triple &T,
     TLI.setUnavailable(LibFunc_strndup);
     TLI.setUnavailable(LibFunc_strnlen);
     TLI.setUnavailable(LibFunc_toascii);
+    TLI.setUnavailable(LibFunc_exp10);
+    TLI.setUnavailable(LibFunc_exp10f);
+    TLI.setUnavailable(LibFunc_exp10l);
   }
 
   // As currently implemented in clang, NVPTX code has no standard library to

llvm/test/Transforms/InstCombine/double-float-shrink-1.ll

@@ -224,11 +224,20 @@ define double @expm1_test2(float %f)   {
 ; exp10f() doesn't exist for this triple, so it doesn't shrink.
 
 define float @exp10_test1(float %f)   {
-; CHECK-LABEL: @exp10_test1(
-; CHECK-NEXT:    [[CONV:%.*]] = fpext float [[F:%.*]] to double
-; CHECK-NEXT:    [[CALL:%.*]] = call fast double @exp10(double [[CONV]])
-; CHECK-NEXT:    [[CONV1:%.*]] = fptrunc double [[CALL]] to float
-; CHECK-NEXT:    ret float [[CONV1]]
+; LINUX-LABEL: define float @exp10_test1(
+; LINUX-SAME: float [[F:%.*]]) {
+; LINUX-NEXT:    [[EXP10F:%.*]] = call fast float @__exp10f(float [[F]])
+; LINUX-NEXT:    ret float [[EXP10F]]
+;
+; MS64-LABEL: define float @exp10_test1(
+; MS64-SAME: float [[F:%.*]]) {
+; MS64-NEXT:    [[EXP10F:%.*]] = call fast float @exp10f(float [[F]])
+; MS64-NEXT:    ret float [[EXP10F]]
+;
+; MS32-LABEL: define float @exp10_test1(
+; MS32-SAME: float [[F:%.*]]) {
+; MS32-NEXT:    [[EXP10F:%.*]] = call fast float @exp10f(float [[F]])
+; MS32-NEXT:    ret float [[EXP10F]]
 ;
   %conv = fpext float %f to double
   %call = call fast double @exp10(double %conv)