From 0a59aab9e19105e0d27d06325d0d2bae2d7b0acd Mon Sep 17 00:00:00 2001 From: spop Date: Fri, 4 Dec 2009 05:27:02 +0000 Subject: [PATCH] For FMA4, force all operands into registers. 2009-12-02 Richard Henderson * config/i386/i386.c (ix86_fixup_binary_operands): For FMA4, force all operands into registers. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@154969 138bc75d-0d04-0410-961f-82ee72b054a4 --- gcc/ChangeLog | 5 +++++ gcc/config/i386/i386.c | 10 ++++++++++ 2 files changed, 15 insertions(+) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index ceb7ba7..16e80f1 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2009-12-02 Richard Henderson + + * config/i386/i386.c (ix86_fixup_binary_operands): For FMA4, force + all operands into registers. + 2009-12-02 Sebastian Pop * config/i386/i386.c (ix86_expand_fma4_multiple_memory): Remove unused diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 82ec08f..436e935 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -13384,6 +13384,16 @@ ix86_fixup_binary_operands (enum rtx_code code, enum machine_mode mode, if (MEM_P (src1) && !rtx_equal_p (dst, src1)) src1 = force_reg (mode, src1); + /* In order for the multiply-add patterns to get matched, we need + to aid combine by forcing all operands into registers to start. */ + if (optimize && TARGET_FMA4) + { + if (MEM_P (src2)) + src2 = force_reg (GET_MODE (src2), src2); + else if (MEM_P (src1)) + src1 = force_reg (GET_MODE (src1), src1); + } + operands[1] = src1; operands[2] = src2; return dst; -- 2.7.4