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| author | law <law@138bc75d-0d04-0410-961f-82ee72b054a4> | 1998-07-16 14:10:24 +0000 |
|---|---|---|
| committer | law <law@138bc75d-0d04-0410-961f-82ee72b054a4> | 1998-07-16 14:10:24 +0000 |
| commit | 58e7b01f92628181984c01da885e5a19c749a01c (patch) | |
| tree | a2690045230b0798c06c17885f7e7a609099ced1 /gcc/config/mn10300 | |
| parent | 492cb13116ca4f5718a7810ee1901d9e00b14e97 (diff) | |
| download | gcc-58e7b01f92628181984c01da885e5a19c749a01c.tar.gz | |
* mn10300.c (count_tst_insns): New arg oreg_countp. Callers changed.
Simplify tests for clearing an address register.
(expand_prologue): Corresponding changes.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@21215 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/config/mn10300')
| -rw-r--r-- | gcc/config/mn10300/mn10300.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/gcc/config/mn10300/mn10300.c b/gcc/config/mn10300/mn10300.c index 7456c32febe..c6102acb1fc 100644 --- a/gcc/config/mn10300/mn10300.c +++ b/gcc/config/mn10300/mn10300.c @@ -382,15 +382,17 @@ can_use_return_insn () /* Count the number of tst insns which compare a data or address register with zero. */ static void -count_tst_insns (dreg_countp, areg_countp) +count_tst_insns (dreg_countp, areg_countp, oreg_countp) int *dreg_countp; int *areg_countp; + int *oreg_countp; { rtx insn; /* Assume no tst insns exist. */ *dreg_countp = 0; *areg_countp = 0; + *oreg_countp = 0; /* If not optimizing, then quit now. */ if (!optimize) @@ -424,8 +426,7 @@ count_tst_insns (dreg_countp, areg_countp) /* Setting an address register to zero can also be optimized, so count it just like a tst insn. */ if (GET_CODE (SET_DEST (pat)) == REG - && GET_CODE (SET_SRC (pat)) == CONST_INT - && INTVAL (SET_SRC (pat)) == 0 + && SET_SRC (pat) == CONST0_RTX (GET_MODE (SET_DEST (pat))) && REGNO_REG_CLASS (REGNO (SET_DEST (pat))) == ADDRESS_REGS) (*areg_countp)++; } @@ -447,16 +448,16 @@ expand_prologue () || regs_ever_live[6] || regs_ever_live[7] || frame_pointer_needed) { - int dreg_count, areg_count; + int dreg_count, areg_count, oreg_count; /* Get a count of the number of tst insns which use address and data registers. */ - count_tst_insns (&dreg_count, &areg_count); + count_tst_insns (&dreg_count, &areg_count, &oreg_count); /* If there's more than one tst insn using a data register, then this optimization is a win. */ - if (dreg_count > 1 - && (!regs_ever_live[2] || !regs_ever_live[3])) + if ((dreg_count > 1 || oreg_count > 1) + && (!regs_ever_live[2] || !regs_ever_live[3])) { if (!regs_ever_live[2]) { @@ -474,8 +475,8 @@ expand_prologue () /* If there's more than two tst insns using an address register, then this optimization is a win. */ - if (areg_count > 2 - && (!regs_ever_live[6] || !regs_ever_live[7])) + if ((areg_count > 2 || oreg_count > 1) + && (!regs_ever_live[6] || !regs_ever_live[7])) { if (!regs_ever_live[6]) { |