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tcg/arm: don't save/restore r7 in prologue/epilogue 

There is no need to save r7, it is used to store the address
of the env structure and is not modified by GCC.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2010-03-20 12:27:42 +01:00
parent 26c5d372e4
commit 9e97d8e941
1 changed files with 6 additions and 6 deletions
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12
tcg/arm/tcg-target.c
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@ -1676,15 +1676,15 @@ static inline void tcg_out_movi(TCGContext *s, TCGType type,
void tcg_target_qemu_prologue(TCGContext *s) void tcg_target_qemu_prologue(TCGContext *s)
{ {
/* Theoretically there is no need to save r12, but an /* There is no need to save r7, it is used to store the address
even number of registers to be saved as per EABI */ of the env structure and is not modified by GCC. */
/* stmdb sp!, { r4 - r12, lr } */ /* stmdb sp!, { r4 - r6, r8 - r11, lr } */
tcg_out32(s, (COND_AL << 28) | 0x092d5ff0); tcg_out32(s, (COND_AL << 28) | 0x092d4f70);
tcg_out_bx(s, COND_AL, TCG_REG_R0); tcg_out_bx(s, COND_AL, TCG_REG_R0);
tb_ret_addr = s->code_ptr; tb_ret_addr = s->code_ptr;
/* ldmia sp!, { r4 - r12, pc } */ /* ldmia sp!, { r4 - r6, r8 - r11, pc } */
tcg_out32(s, (COND_AL << 28) | 0x08bd9ff0); tcg_out32(s, (COND_AL << 28) | 0x08bd8f70);
} }