diff options
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/config/i386/i386.md | 16 |
2 files changed, 17 insertions, 6 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 2c27cb5..265cc29 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2016-08-21 Uros Bizjak <ubizjak@gmail.com> + + PR target/77270 + * config/i386/i386.md (prefetch): When TARGET_PRFCHW or + TARGET_PREFETCHWT1 are disabled, emit 3dNOW! write prefetches for + non-SSE2 athlons only, otherwise prefer SSE prefetches. + 2016-08-20 Kugan Vivekanandarajah <kuganv@linaro.org> * tree-vrp.c (vrp_visit_assignment_or_call): Changed to Return VR. diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md index 36ae876..9454458 100644 --- a/gcc/config/i386/i386.md +++ b/gcc/config/i386/i386.md @@ -18634,20 +18634,24 @@ gcc_assert (IN_RANGE (locality, 0, 3)); /* Use 3dNOW prefetch in case we are asking for write prefetch not - supported by SSE counterpart or the SSE prefetch is not available - (K6 machines). Otherwise use SSE prefetch as it allows specifying - of locality. */ + supported by SSE counterpart (non-SSE2 athlon machines) or the + SSE prefetch is not available (K6 machines). Otherwise use SSE + prefetch as it allows specifying of locality. */ if (write) { if (TARGET_PREFETCHWT1) operands[2] = GEN_INT (MAX (locality, 2)); - else if (TARGET_3DNOW || TARGET_PRFCHW) + else if (TARGET_PRFCHW) operands[2] = GEN_INT (3); + else if (TARGET_3DNOW && !TARGET_SSE2) + operands[2] = GEN_INT (3); + else if (TARGET_PREFETCH_SSE) + operands[1] = const0_rtx; else { - gcc_assert (TARGET_PREFETCH_SSE); - operands[1] = const0_rtx; + gcc_assert (TARGET_3DNOW); + operands[2] = GEN_INT (3); } } else |