If I run gcc -fverbose-asm -mtune=native -march=native -S x.c
I get
cat x.s:
.file "x.c"
# GNU C (GCC) version 4.4.0 20090506 (Red Hat 4.4.0-4) (x86_64-redhat-linux)
# compiled by GNU C version 4.4.0 20090506 (Red Hat 4.4.0-4), GMP
version 4.2.4, MPFR version 2.4.1.
# GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
# options passed: x.c -march=core2 -mcx16 -msahf --param l1-cache-size=32
# --param l1-cache-line-size=64 --param l2-cache-size=2048 -mtune=core2
# -fverbose-asm
# options enabled: -falign-loops -fargument-alias
...................
# -mfp-ret-in-387 -mfused-madd -mglibc -mieee-fp -mmmx -mno-sse4
# -mpush-args -mred-zone -msahf -msse -msse2 -msse3 -mssse3
............
cat /proc/cpuinfo:
flags : .....sse sse2 .... ssse3 .... sse4_1 ...
Is this a bug in the march-native code, or is there a reason sse4.1 is
not enabled (this cpu does not support sse4.2)?
sean
