i386: Tweak i386-expand.cc to restore bootstrap on RHEL.

This is a minor change to restore bootstrap on systems using gcc 4.8
as a host compiler.  The fatal error is:

In file included from gcc/gcc/coretypes.h:471:0,
                 from gcc/gcc/config/i386/i386-expand.cc:23:
gcc/gcc/config/i386/i386-expand.cc: In function 'void ix86_expand_fp_absneg_operator(rtx_code, machine_mode, rtx_def**)':
./insn-modes.h:315:75: error: temporary of non-literal type 'scalar_float_mode' in a constant expression
 #define HFmode (scalar_float_mode ((scalar_float_mode::from_int) E_HFmode))
                                                                           ^
gcc/gcc/config/i386/i386-expand.cc:2179:8: note: in expansion of macro 'HFmode'
   case HFmode:
        ^

The solution is to use the E_?Fmode enumeration constants as case values
in switch statements.

2024-07-14  Roger Sayle  <roger@nextmovesoftware.com>

	* config/i386/i386-expand.cc (ix86_expand_fp_absneg_operator):
	Use E_?Fmode enumeration constants in switch statement.
	(ix86_expand_copysign): Likewise.
	(ix86_expand_xorsign): Likewise.

diff --git a/gcc/config/i386/i386-expand.cc b/gcc/config/i386/i386-expand.cc
index cfcfdd94e8f092d2a41b2465881860bb872e5f65..9a31e6df2aa263e0ac44718d6efcbed6e8c54aa6 100644 (file)
--- a/gcc/config/i386/i386-expand.cc
+++ b/gcc/config/i386/i386-expand.cc
@@ -2176,19 +2176,19 @@ ix86_expand_fp_absneg_operator (enum rtx_code code, machine_mode mode,
 
   switch (mode)
   {
-  case HFmode:
+  case E_HFmode:
     use_sse = true;
     vmode = V8HFmode;
     break;
-  case BFmode:
+  case E_BFmode:
     use_sse = true;
     vmode = V8BFmode;
     break;
-  case SFmode:
+  case E_SFmode:
     use_sse = TARGET_SSE_MATH && TARGET_SSE;
     vmode = V4SFmode;
     break;
-  case DFmode:
+  case E_DFmode:
     use_sse = TARGET_SSE_MATH && TARGET_SSE2;
     vmode = V2DFmode;
     break;
@@ -2330,19 +2330,19 @@ ix86_expand_copysign (rtx operands[])
 
   switch (mode)
   {
-  case HFmode:
+  case E_HFmode:
     vmode = V8HFmode;
     break;
-  case BFmode:
+  case E_BFmode:
     vmode = V8BFmode;
     break;
-  case SFmode:
+  case E_SFmode:
     vmode = V4SFmode;
     break;
-  case DFmode:
+  case E_DFmode:
     vmode = V2DFmode;
     break;
-  case TFmode:
+  case E_TFmode:
     vmode = mode;
     break;
   default:
@@ -2410,16 +2410,16 @@ ix86_expand_xorsign (rtx operands[])
 
   switch (mode)
   {
-  case HFmode:
+  case E_HFmode:
     vmode = V8HFmode;
     break;
-  case BFmode:
+  case E_BFmode:
     vmode = V8BFmode;
     break;
-  case SFmode:
+  case E_SFmode:
     vmode = V4SFmode;
     break;
-  case DFmode:
+  case E_DFmode:
     vmode = V2DFmode;
     break;
   default: