[builtins] Avoid enum name conflicts with fenv.h

After a follow-up change (D98332) this header can be included the same time
as fenv.h when running the tests. To avoid enum members conflicting with
the macros/enums defined in the host fenv.h, prefix them with CRT_.

Reviewed By: peter.smith

Differential Revision: https://reviews.llvm.org/D98333

compiler-rt/lib/builtins/aarch64/fp_mode.c

@@ -23,24 +23,25 @@
 #ifndef __ARM_FP
 // For soft float targets, allow changing rounding mode by overriding the weak
 // __aarch64_fe_default_rmode symbol.
-FE_ROUND_MODE __attribute__((weak)) __aarch64_fe_default_rmode = FE_TONEAREST;
+CRT_FE_ROUND_MODE __attribute__((weak)) __aarch64_fe_default_rmode =
+    CRT_FE_TONEAREST;
 #endif
 
-FE_ROUND_MODE __fe_getround() {
+CRT_FE_ROUND_MODE __fe_getround() {
 #ifdef __ARM_FP
   uint64_t fpcr;
   __asm__ __volatile__("mrs  %0, fpcr" : "=r" (fpcr));
   fpcr = fpcr >> AARCH64_RMODE_SHIFT & AARCH64_RMODE_MASK;
   switch (fpcr) {
     case AARCH64_UPWARD:
-      return FE_UPWARD;
+      return CRT_FE_UPWARD;
     case AARCH64_DOWNWARD:
-      return FE_DOWNWARD;
+      return CRT_FE_DOWNWARD;
     case AARCH64_TOWARDZERO:
-      return FE_TOWARDZERO;
+      return CRT_FE_TOWARDZERO;
     case AARCH64_TONEAREST:
     default:
-      return FE_TONEAREST;
+      return CRT_FE_TONEAREST;
   }
 #else
   return __aarch64_fe_default_rmode;

compiler-rt/lib/builtins/arm/fp_mode.c

@@ -23,24 +23,25 @@
 #ifndef __ARM_FP
 // For soft float targets, allow changing rounding mode by overriding the weak
 // __arm_fe_default_rmode symbol.
-FE_ROUND_MODE __attribute__((weak)) __arm_fe_default_rmode = FE_TONEAREST;
+CRT_FE_ROUND_MODE __attribute__((weak)) __arm_fe_default_rmode =
+    CRT_FE_TONEAREST;
 #endif
 
-FE_ROUND_MODE __fe_getround() {
+CRT_FE_ROUND_MODE __fe_getround() {
 #ifdef __ARM_FP
   uint32_t fpscr;
   __asm__ __volatile__("vmrs  %0, fpscr" : "=r" (fpscr));
   fpscr = fpscr >> ARM_RMODE_SHIFT & ARM_RMODE_MASK;
   switch (fpscr) {
     case ARM_UPWARD:
-      return FE_UPWARD;
+      return CRT_FE_UPWARD;
     case ARM_DOWNWARD:
-      return FE_DOWNWARD;
+      return CRT_FE_DOWNWARD;
     case ARM_TOWARDZERO:
-      return FE_TOWARDZERO;
+      return CRT_FE_TOWARDZERO;
     case ARM_TONEAREST:
     default:
-      return FE_TONEAREST;
+      return CRT_FE_TONEAREST;
   }
 #else
   return __arm_fe_default_rmode;

compiler-rt/lib/builtins/fp_add_impl.inc

@@ -151,19 +151,19 @@ static __inline fp_t __addXf3__(fp_t a, fp_t b) {
   // Perform the final rounding.  The result may overflow to infinity, but
   // that is the correct result in that case.
   switch (__fe_getround()) {
-  case FE_TONEAREST:
+  case CRT_FE_TONEAREST:
     if (roundGuardSticky > 0x4)
       result++;
     if (roundGuardSticky == 0x4)
       result += result & 1;
     break;
-  case FE_DOWNWARD:
+  case CRT_FE_DOWNWARD:
     if (resultSign && roundGuardSticky) result++;
     break;
-  case FE_UPWARD:
+  case CRT_FE_UPWARD:
     if (!resultSign && roundGuardSticky) result++;
     break;
-  case FE_TOWARDZERO:
+  case CRT_FE_TOWARDZERO:
     break;
   }
   if (roundGuardSticky)

compiler-rt/lib/builtins/fp_mode.c

@@ -15,9 +15,7 @@
 #include "fp_mode.h"
 
 // IEEE-754 default rounding (to nearest, ties to even).
-FE_ROUND_MODE __fe_getround() {
+CRT_FE_ROUND_MODE __fe_getround() { return CRT_FE_TONEAREST; }
-  return FE_TONEAREST;
-}
 
 int __fe_raise_inexact() {
   return 0;

compiler-rt/lib/builtins/fp_mode.h

@@ -17,13 +17,13 @@
 #define FP_MODE
 
 typedef enum {
-  FE_TONEAREST,
+  CRT_FE_TONEAREST,
-  FE_DOWNWARD,
+  CRT_FE_DOWNWARD,
-  FE_UPWARD,
+  CRT_FE_UPWARD,
-  FE_TOWARDZERO
+  CRT_FE_TOWARDZERO
-} FE_ROUND_MODE;
+} CRT_FE_ROUND_MODE;
 
-FE_ROUND_MODE __fe_getround(void);
+CRT_FE_ROUND_MODE __fe_getround(void);
 int __fe_raise_inexact(void);
 
 #endif // FP_MODE_H

compiler-rt/lib/builtins/i386/fp_mode.c

@@ -14,22 +14,22 @@
 #define X87_TOWARDZERO 0x0c00
 #define X87_RMODE_MASK (X87_TONEAREST | X87_UPWARD | X87_DOWNWARD | X87_TOWARDZERO)
 
-FE_ROUND_MODE __fe_getround() {
+CRT_FE_ROUND_MODE __fe_getround() {
   // Assume that the rounding mode state for the fpu agrees with the SSE unit.
   unsigned short cw;
   __asm__ __volatile__ ("fnstcw %0" : "=m" (cw));
 
   switch (cw & X87_RMODE_MASK) {
     case X87_TONEAREST:
-      return FE_TONEAREST;
+      return CRT_FE_TONEAREST;
     case X87_DOWNWARD:
-      return FE_DOWNWARD;
+      return CRT_FE_DOWNWARD;
     case X87_UPWARD:
-      return FE_UPWARD;
+      return CRT_FE_UPWARD;
     case X87_TOWARDZERO:
-      return FE_TOWARDZERO;
+      return CRT_FE_TOWARDZERO;
   }
-  return FE_TONEAREST;
+  return CRT_FE_TONEAREST;
 }
 
 int __fe_raise_inexact() {