re PR target/78458 (LRA ICE building libgcc for powerpc-linux-gnuspe e500v2)

gcc/
	PR target/78458
	* config/rs6000/rs6000.h (HARD_REGNO_CALLER_SAVE_MODE): Return MODE
	if it is at least NREGS wide.

gcc/testsuite/
	PR target/78458
	* gcc.target/powerpc/pr78458.c: New.

From-SVN: r242818

gcc/ChangeLog

+2016-11-23  Peter Bergner  <bergner@vnet.ibm.com>
+
+	PR target/78458
+	* config/rs6000/rs6000.h (HARD_REGNO_CALLER_SAVE_MODE): Return MODE
+	if it is at least NREGS wide.
+
 2016-11-23  Joseph Myers  <joseph@codesourcery.com>
 
 	* config/rs6000/rs6000.c (rs6000_legitimate_offset_address_p): For

gcc/config/rs6000/rs6000.h

@@ -1279,9 +1279,11 @@ enum data_align { align_abi, align_opt, align_both };
    enough space to account for vectors in FP regs.  However, TFmode/TDmode
    should not use VSX instructions to do a caller save. */
 #define HARD_REGNO_CALLER_SAVE_MODE(REGNO, NREGS, MODE)			\
-  (TARGET_VSX								\
-   && ((MODE) == VOIDmode || ALTIVEC_OR_VSX_VECTOR_MODE (MODE))		\
-   && FP_REGNO_P (REGNO)						\
+  ((NREGS) <= rs6000_hard_regno_nregs[MODE][REGNO]			\
+   ? (MODE)								\
+   : TARGET_VSX								\
+     && ((MODE) == VOIDmode || ALTIVEC_OR_VSX_VECTOR_MODE (MODE))	\
+     && FP_REGNO_P (REGNO)						\
    ? V2DFmode								\
    : TARGET_E500_DOUBLE && (MODE) == SImode				\
    ? SImode								\

gcc/testsuite/ChangeLog

+2016-11-23  Peter Bergner  <bergner@vnet.ibm.com>
+
+	PR target/78458
+	* gcc.target/powerpc/pr78458.c: New.
+
 2016-11-23  Joseph Myers  <joseph@codesourcery.com>
 
 	* gcc.c-torture/compile/20161123-1.c: New test.

gcc/testsuite/gcc.target/powerpc/pr78458.c

+/* { dg-do compile } */
+/* { dg-options "-mcpu=8548 -mspe -mabi=spe -mlra" } */
+/* { dg-skip-if "not an SPE target" { ! powerpc_spe_nocache } } */
+
+extern void bar (void);
+long double
+pr78458 (long double p1)
+{
+  bar ();
+  asm volatile ("# clobbers" :::
+		"r14", "r15", "r16", "r17", "r18", "r19",
+		"r20", "r21", "r22", "r23", "r24", "r25",
+		"r26", "r27", "r28", "r29", "r30", "r31");
+  return p1;
+}