From b81bd6c9a2a22462cba3e8bdd42467c449c36a80 Mon Sep 17 00:00:00 2001 From: Uros Bizjak Date: Mon, 8 May 2006 08:10:03 +0200 Subject: [PATCH] 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 --- gcc/ChangeLog | 7 +++++++ gcc/config/i386/i386.c | 17 ++++++++++++++++- 2 files changed, 23 insertions(+), 1 deletion(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 1bb7acb3152..631921b45a6 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2006-05-08 Uros Bizjak + + 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 * config/arm/constraints.md (c): Fix a typo. diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index a092484da18..df5a4e68d43 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: -- 2.30.2