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| author | Richard Kenner <kenner@gcc.gnu.org> | 1996-04-16 17:43:09 -0400 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1996-04-16 17:43:09 -0400 |
| commit | 70cff8f545f04281a8cf0e8d6ee604ee8026fe32 (patch) | |
| tree | dc9445f7b32ab91c877bb846c684e92e8ba11fd4 /gcc | |
| parent | 0500d6f9b27f4f499b7aa2256ebc35c1e3be57a2 (diff) | |
| download | gcc-70cff8f545f04281a8cf0e8d6ee604ee8026fe32.zip gcc-70cff8f545f04281a8cf0e8d6ee604ee8026fe32.tar.gz gcc-70cff8f545f04281a8cf0e8d6ee604ee8026fe32.tar.bz2 | |
(addsidi3_2): Handle non-MEM overlap case.
From-SVN: r11829
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/config/i386/i386.md | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md index 7f6cd80..f307767 100644 --- a/gcc/config/i386/i386.md +++ b/gcc/config/i386/i386.md @@ -2764,6 +2764,36 @@ if (GET_CODE (operands[0]) != MEM || GET_CODE (operands[1]) != MEM) { + if (rtx_equal_p (low[0], operands[2])) + { + output_asm_insn (AS2 (mov%L0,%2,%0), high); + output_asm_insn (AS2 (add%L0,%1,%0), low); + output_asm_insn (AS2 (adc%L0,%1,%0), high); + RET; + } + if (rtx_equal_p (high[0], operands[2])) + { + if (GET_CODE (operands[0]) != MEM) + { + output_asm_insn (AS2 (mov%L0,%2,%0), low); + output_asm_insn (AS2 (mov%L0,%2,%0), high); + output_asm_insn (AS2 (add%L0,%1,%0), low); + output_asm_insn (AS2 (adc%L0,%1,%0), high); + } + else + { + /* It's too late to ask for a scratch now - but this + will probably not happen too often. */ + output_asm_insn (AS2 (add%L1,%2,%1), low); + output_asm_insn (AS2 (mov%L0,%1,%0), low); + output_asm_insn (AS2 (mov%L1,%2,%1), low); + output_asm_insn (AS2 (mov%L0,%2,%0), high); + output_asm_insn (AS2 (adc%L0,%1,%0), high); + output_asm_insn (AS2 (sub%L1,%0,%1), low); + output_asm_insn (AS1 (neg%L1,%1), low); + } + RET; + } output_asm_insn (AS2 (mov%L1,%3,%1), xops); output_asm_insn (AS2 (mov%L0,%2,%0), xops); } |