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| author | Uros Bizjak <uros@kss-loka.si> | 2006-05-08 08:10:03 +0200 |
|---|---|---|
| committer | Uros Bizjak <uros@gcc.gnu.org> | 2006-05-08 08:10:03 +0200 |
| commit | b81bd6c9a2a22462cba3e8bdd42467c449c36a80 (patch) | |
| tree | c017b75f89fbb9eab872baa10d877f7a5c3d1c69 /gcc | |
| parent | bca504069d503b69f51f380c86c5c929651c9da8 (diff) | |
| download | gcc-b81bd6c9a2a22462cba3e8bdd42467c449c36a80.zip gcc-b81bd6c9a2a22462cba3e8bdd42467c449c36a80.tar.gz gcc-b81bd6c9a2a22462cba3e8bdd42467c449c36a80.tar.bz2 | |
re PR target/27277 (standard i387 constant loading insns (fldz, fld1) are not generated anymore)
PR target/27277
* config/i386/i386.c (ix86_rtx_costs) [FLOAT_EXTEND]: For
standard 80387 constants, raise the cost to prevent
compress_float_constant() to generate load from memory.
From-SVN: r113622
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/config/i386/i386.c | 17 |
2 files changed, 23 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 1bb7acb..631921b 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2006-05-08 Uros Bizjak <uros@kss-loka.si> + + PR target/27277 + * config/i386/i386.c (ix86_rtx_costs) [FLOAT_EXTEND]: For + standard 80387 constants, raise the cost to prevent + compress_float_constant() to generate load from memory. + 2006-05-08 Kazu Hirata <kazu@codesourcery.com> * config/arm/constraints.md (c): Fix a typo. diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index a092484..df5a4e6 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -17102,7 +17102,22 @@ ix86_rtx_costs (rtx x, int code, int outer_code, int *total) if (!TARGET_SSE_MATH || mode == XFmode || (mode == DFmode && !TARGET_SSE2)) - *total = 0; + /* For standard 80387 constants, raise the cost to prevent + compress_float_constant() to generate load from memory. */ + switch (standard_80387_constant_p (XEXP (x, 0))) + { + case -1: + case 0: + *total = 0; + break; + case 1: /* 0.0 */ + *total = 1; + break; + default: + *total = (x86_ext_80387_constants & TUNEMASK + || optimize_size + ? 1 : 0); + } return false; case ABS: |