[gcc(refs/users/clyon/heads/mve-autovec)] fix for stack-usage-1.c

[Christophe Lyon]

https://gcc.gnu.org/g:28c748b25e9bfabefb2020899b32aebfd7e01124

commit 28c748b25e9bfabefb2020899b32aebfd7e01124
Author: Christophe Lyon <christophe.lyon@foss.st.com>
Date:   Mon Dec 20 21:26:59 2021 +0000

    fix for stack-usage-1.c

Diff:
---
 gcc/config/arm/arm.c | 3 +++
 gcc/config/arm/arm.h | 4 +++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index a5b403eb3e4..fa17bdb50d4 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -25287,6 +25287,9 @@ thumb2_asm_output_opcode (FILE * stream)
 static unsigned int
 arm_hard_regno_nregs (unsigned int regno, machine_mode mode)
 {
+  if (IS_VPR_REGNUM (regno))
+    return CEIL (GET_MODE_SIZE (mode), 2);
+
   if (TARGET_32BIT
       && regno > PC_REGNUM
       && regno != FRAME_POINTER_REGNUM
diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h
index 08b858effd8..c5e994df1ce 100644
--- a/gcc/config/arm/arm.h
+++ b/gcc/config/arm/arm.h
@@ -1456,7 +1456,9 @@ extern const char *fp_sysreg_names[NB_FP_SYSREGS];
    ARM regs are UNITS_PER_WORD bits.  
    FIXME: Is this true for iWMMX?  */
 #define CLASS_MAX_NREGS(CLASS, MODE)  \
-  (ARM_NUM_REGS (MODE))
+  (CLASS == VPR_REG)		      \
+  ? CEIL (GET_MODE_SIZE (MODE), 2)    \
+  : (ARM_NUM_REGS (MODE))
 
 /* If defined, gives a class of registers that cannot be used as the
    operand of a SUBREG that changes the mode of the object illegally.  */