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| author | Richard Biener <rguenther@suse.de> | 2021-11-04 09:17:18 +0100 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2021-11-04 13:33:19 +0100 |
| commit | d13603501680fcdbb933cb086cd01fcc39be1908 (patch) | |
| tree | 8fe323a2669e7e309b0cac142890bc18170704fd /gcc | |
| parent | d43fc1df7344e9cb705d3ca40217ff4e39aab5bf (diff) | |
| download | gcc-d13603501680fcdbb933cb086cd01fcc39be1908.zip gcc-d13603501680fcdbb933cb086cd01fcc39be1908.tar.gz gcc-d13603501680fcdbb933cb086cd01fcc39be1908.tar.bz2 | |
rtl-optimization/103075 - avoid ICEing on unfolded int-to-float converts
The following avoids asserting in exact_int_to_float_conversion_p that
the argument is not constant which it in fact can be with
-frounding-math and inexact int-to-float conversions. Say so.
2021-11-04 Richard Biener <rguenther@suse.de>
PR rtl-optimization/103075
* simplify-rtx.c (exact_int_to_float_conversion_p): Return
false for a VOIDmode operand.
* gcc.dg/pr103075.c: New testcase.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/simplify-rtx.c | 8 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/pr103075.c | 8 |
2 files changed, 13 insertions, 3 deletions
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index 9038aff..eea7476 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -899,10 +899,12 @@ simplify_context::simplify_unary_operation (rtx_code code, machine_mode mode, static bool exact_int_to_float_conversion_p (const_rtx op) { - int out_bits = significand_size (GET_MODE_INNER (GET_MODE (op))); machine_mode op0_mode = GET_MODE (XEXP (op, 0)); - /* Constants shouldn't reach here. */ - gcc_assert (op0_mode != VOIDmode); + /* Constants can reach here with -frounding-math, if they do then + the conversion isn't exact. */ + if (op0_mode == VOIDmode) + return false; + int out_bits = significand_size (GET_MODE_INNER (GET_MODE (op))); int in_prec = GET_MODE_UNIT_PRECISION (op0_mode); int in_bits = in_prec; if (HWI_COMPUTABLE_MODE_P (op0_mode)) diff --git a/gcc/testsuite/gcc.dg/pr103075.c b/gcc/testsuite/gcc.dg/pr103075.c new file mode 100644 index 0000000..b332fb0 --- /dev/null +++ b/gcc/testsuite/gcc.dg/pr103075.c @@ -0,0 +1,8 @@ +/* { dg-do compile } */ +/* { dg-options "-O -frounding-math" } */ + +float +foo (void) +{ + return (float) 0x1699925 * 1.1; +} |