diff options
Diffstat (limited to 'gcc/config/i386')
| -rw-r--r-- | gcc/config/i386/i386.c | 7 | ||||
| -rw-r--r-- | gcc/config/i386/i386.opt | 4 |
2 files changed, 10 insertions, 1 deletions
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 9b24efce9c2..4db74171f1a 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -23641,7 +23641,12 @@ ix86_expand_call (rtx retval, rtx fnaddr, rtx callarg1, use_reg (&use, pic_offset_table_rtx); } - if (TARGET_64BIT && INTVAL (callarg2) >= 0) + /* Skip setting up RAX register for -mskip-rax-setup when there are no + parameters passed in vector registers. */ + if (TARGET_64BIT + && (INTVAL (callarg2) > 0 + || (INTVAL (callarg2) == 0 + && (TARGET_SSE || !flag_skip_rax_setup)))) { rtx al = gen_rtx_REG (QImode, AX_REG); emit_move_insn (al, callarg2); diff --git a/gcc/config/i386/i386.opt b/gcc/config/i386/i386.opt index 084a2486353..59a2695b3cd 100644 --- a/gcc/config/i386/i386.opt +++ b/gcc/config/i386/i386.opt @@ -611,6 +611,10 @@ mfentry Target Report Var(flag_fentry) Init(-1) Emit profiling counter call at function entry before prologue. +mskip-rax-setup +Target Report Var(flag_skip_rax_setup) Init(0) +Skip setting up RAX register when passing variable arguments. + m8bit-idiv Target Report Mask(USE_8BIT_IDIV) Save Expand 32bit/64bit integer divide into 8bit unsigned integer divide with run-time check |