This testcase should generate min{s,d}s, max{s,d}s SSE insn. It looks that
min?f, max?f pattern is converted to equivalent i387 insn sequence, because the
output is expected in FP reg. However, the result of min/max should be _moved_
from SSE to FP reg.
Testcase:
float minf(float a, float b) {
return a <= b ? a : b;
}
when compiled with 'gcc -O2 -ffast-math -march=pentium4 -mfpmath=sse
-fomit-frame-pointer':
minf:
subl $4, %esp
flds 8(%esp)
movss 12(%esp), %xmm0
movss %xmm0, (%esp)
flds (%esp)
fcomi %st(1), %st
fcmovnb %st(1), %st
fstp %st(1)
addl $4, %esp
ret
Equivalent code could be something like:
minf:
subl $4, %esp
movss 8(%esp), %xmm0
minss %xmm0, 12(%esp)
movss %xmm0, (%esp)
flds (%esp)
addl $4, %esp
ret
Uros.
--
Summary: minss/maxss SSE insn not generated for -mfpmath=sse
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: uros at kss-loka dot si
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19250
