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| author | dj <dj@138bc75d-0d04-0410-961f-82ee72b054a4> | 2005-12-16 01:31:39 +0000 |
|---|---|---|
| committer | dj <dj@138bc75d-0d04-0410-961f-82ee72b054a4> | 2005-12-16 01:31:39 +0000 |
| commit | c47b86425e4c37be4d2d73d8781bd8cb2424af0f (patch) | |
| tree | d42ce2ab6f459bf43ed2bd447cfcde5d0656e0fe /gcc/config/m32c/m32c.c | |
| parent | 449d37610c15b7f7fba80fdc301136fae951741a (diff) | |
| download | gcc-c47b86425e4c37be4d2d73d8781bd8cb2424af0f.tar.gz | |
* config/m32c/predicates.md (m32c_psi_scale): New.
* config/m32c/m32c.c (m32c_expand_neg_mulpsi3): New.
* config/m32c/muldiv.md (mulpsi3): Support negative constants.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@108620 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/config/m32c/m32c.c')
| -rw-r--r-- | gcc/config/m32c/m32c.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/gcc/config/m32c/m32c.c b/gcc/config/m32c/m32c.c index 97b095328e4..8580922a402 100644 --- a/gcc/config/m32c/m32c.c +++ b/gcc/config/m32c/m32c.c @@ -2798,6 +2798,30 @@ m32c_prepare_shift (rtx * operands, int scale, int bits) return 0; } +/* The m32c has a limited range of operations that work on PSImode + values; we have to expand to SI, do the math, and truncate back to + PSI. Yes, this is expensive, but hopefully gcc will learn to avoid + those cases. */ +void +m32c_expand_neg_mulpsi3 (rtx * operands) +{ + /* operands: a = b * i */ + rtx temp1; /* b as SI */ + rtx temp2; /* -b as SI */ + rtx temp3; /* -b as PSI */ + rtx scale; + + temp1 = gen_reg_rtx (SImode); + temp2 = gen_reg_rtx (SImode); + temp3 = gen_reg_rtx (PSImode); + scale = GEN_INT (- INTVAL (operands[2])); + + emit_insn (gen_zero_extendpsisi2 (temp1, operands[1])); + emit_insn (gen_negsi2 (temp2, temp1)); + emit_insn (gen_truncsipsi2 (temp3, temp2)); + emit_insn (gen_mulpsi3 (operands[0], temp3, scale)); +} + /* Pattern Output Functions */ /* Returns TRUE if the current function is a leaf, and thus we can |