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(num_sign_bit_copies): Fix 1-off error in PLUS case.

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From-SVN: r2807
This commit is contained in:
Richard Stallman 1992-11-26 17:06:44 +00:00
parent 3b2f07926a
commit d038420ea8
1 changed files with 1 additions and 1 deletions
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2
gcc/combine.c
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@ -6355,7 +6355,7 @@ num_sign_bit_copies (x, mode)
sig = significant_bits (XEXP (x, 0), mode);
if ((((HOST_WIDE_INT) 1 << (bitwidth - 1)) & sig) == 0)
return (sig == 1 || sig == 0 ? bitwidth
: bitwidth - floor_log2 (sig));
: bitwidth - floor_log2 (sig) - 1);
}
num0 = num_sign_bit_copies (XEXP (x, 0), mode);