diff options
Diffstat (limited to 'packages/gcc/gcc-3.3.3/arm-ldm.dpatch')
| -rw-r--r-- | packages/gcc/gcc-3.3.3/arm-ldm.dpatch | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/packages/gcc/gcc-3.3.3/arm-ldm.dpatch b/packages/gcc/gcc-3.3.3/arm-ldm.dpatch index e69de29bb2..561624f39c 100644 --- a/packages/gcc/gcc-3.3.3/arm-ldm.dpatch +++ b/packages/gcc/gcc-3.3.3/arm-ldm.dpatch @@ -0,0 +1,148 @@ +#! /bin/sh -e + +src=gcc +if [ $# -eq 3 -a "$2" = '-d' ]; then + pdir="-d $3" + src=$3/gcc +elif [ $# -ne 1 ]; then + echo >&2 "`basename $0`: script expects -patch|-unpatch as argument" + exit 1 +fi +case "$1" in + -patch) + patch $pdir -f --no-backup-if-mismatch -p0 --fuzz 10 < $0 + ;; + -unpatch) + patch $pdir -f --no-backup-if-mismatch -R -p0 --fuzz 10 < $0 + ;; + *) + echo >&2 "`basename $0`: script expects -patch|-unpatch as argument" + exit 1 +esac +exit 0 + +# DP: try harder to avoid ldm in function epilogues + +--- gcc/config/arm/arm.c Fri Mar 5 18:49:42 2004 ++++ gcc/config/arm/arm.c Fri Mar 5 16:00:21 2004 +@@ -7598,6 +7629,26 @@ + return_used_this_function = 0; + } + ++/* Return the number (counting from 0) of ++ the least significant set bit in MASK. */ ++ ++#ifdef __GNUC__ ++inline ++#endif ++static int ++number_of_first_bit_set (mask) ++ int mask; ++{ ++ int bit; ++ ++ for (bit = 0; ++ (mask & (1 << bit)) == 0; ++ ++bit) ++ continue; ++ ++ return bit; ++} ++ + const char * + arm_output_epilogue (really_return) + int really_return; +@@ -7788,27 +7839,47 @@ + saved_regs_mask |= (1 << PC_REGNUM); + } + +- /* Load the registers off the stack. If we only have one register +- to load use the LDR instruction - it is faster. */ +- if (saved_regs_mask == (1 << LR_REGNUM)) +- { +- /* The exception handler ignores the LR, so we do +- not really need to load it off the stack. */ +- if (eh_ofs) +- asm_fprintf (f, "\tadd\t%r, %r, #4\n", SP_REGNUM, SP_REGNUM); +- else +- asm_fprintf (f, "\tldr\t%r, [%r], #4\n", LR_REGNUM, SP_REGNUM); +- } +- else if (saved_regs_mask) ++ if (saved_regs_mask) + { +- if (saved_regs_mask & (1 << SP_REGNUM)) +- /* Note - write back to the stack register is not enabled +- (ie "ldmfd sp!..."). We know that the stack pointer is +- in the list of registers and if we add writeback the +- instruction becomes UNPREDICTABLE. */ +- print_multi_reg (f, "ldmfd\t%r", SP_REGNUM, saved_regs_mask); ++ /* Load the registers off the stack. If we only have one register ++ to load use the LDR instruction - it is faster. */ ++ if (bit_count (saved_regs_mask) == 1) ++ { ++ int reg = number_of_first_bit_set (saved_regs_mask); ++ ++ switch (reg) ++ { ++ case SP_REGNUM: ++ /* Mustn't use base writeback when loading SP. */ ++ asm_fprintf (f, "\tldr\t%r, [%r]\n", SP_REGNUM, SP_REGNUM); ++ break; ++ ++ case LR_REGNUM: ++ if (eh_ofs) ++ { ++ /* The exception handler ignores the LR, so we do ++ not really need to load it off the stack. */ ++ asm_fprintf (f, "\tadd\t%r, %r, #4\n", SP_REGNUM, SP_REGNUM); ++ break; ++ } ++ /* else fall through */ ++ ++ default: ++ asm_fprintf (f, "\tldr\t%r, [%r], #4\n", reg, SP_REGNUM); ++ break; ++ } ++ } + else +- print_multi_reg (f, "ldmfd\t%r!", SP_REGNUM, saved_regs_mask); ++ { ++ if (saved_regs_mask & (1 << SP_REGNUM)) ++ /* Note - write back to the stack register is not enabled ++ (ie "ldmfd sp!..."). We know that the stack pointer is ++ in the list of registers and if we add writeback the ++ instruction becomes UNPREDICTABLE. */ ++ print_multi_reg (f, "ldmfd\t%r", SP_REGNUM, saved_regs_mask); ++ else ++ print_multi_reg (f, "ldmfd\t%r!", SP_REGNUM, saved_regs_mask); ++ } + } + + if (current_function_pretend_args_size) +@@ -9610,26 +9677,6 @@ + } + } + +-/* Return the number (counting from 0) of +- the least significant set bit in MASK. */ +- +-#ifdef __GNUC__ +-inline +-#endif +-static int +-number_of_first_bit_set (mask) +- int mask; +-{ +- int bit; +- +- for (bit = 0; +- (mask & (1 << bit)) == 0; +- ++bit) +- continue; +- +- return bit; +-} +- + /* Generate code to return from a thumb function. + If 'reg_containing_return_addr' is -1, then the return address is + actually on the stack, at the stack pointer. */ |