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(try_combine): Only use I2DEST as a scratch reg for 

a split if it does not overlap any inputs of NEWPAT.

From-SVN: r2857
This commit is contained in:
Jim Wilson 1992-12-10 12:52:48 -08:00
parent 4090a6b33d
commit a70c61d9c4
1 changed files with 9 additions and 1 deletions
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10
gcc/combine.c
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@ -1535,7 +1535,15 @@ try_combine (i3, i2, i1)
convert I2DEST to the mode of the source of NEWPAT if we can. */
m_split = split_insns (newpat, i3);
if (m_split == 0)
/* We can only use I2DEST as a scratch reg if it doesn't overlap any
inputs of NEWPAT. */
/* ??? If I2DEST is not safe, and I1DEST exists, then it would be
possible to try that as a scratch reg. This would require adding
more code to make it work though. */
if (m_split == 0 && ! reg_overlap_mentioned_p (ni2dest, newpat))
{
/* If I2DEST is a hard register or the only use of a pseudo,
we can change its mode. */