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| author | H.J. Lu <hongjiu.lu@intel.com> | 2015-10-08 18:57:11 +0000 |
|---|---|---|
| committer | H.J. Lu <hjl@gcc.gnu.org> | 2015-10-08 11:57:11 -0700 |
| commit | bc8642d6cef0782bc3181ade2ba577e53bcefc15 (patch) | |
| tree | 845b51076e952216469c5e571cdda916683ab1b5 /gcc | |
| parent | d1acc3f4d2dbe3619f977f2cacca446bff74e1a7 (diff) | |
| download | gcc-bc8642d6cef0782bc3181ade2ba577e53bcefc15.zip gcc-bc8642d6cef0782bc3181ade2ba577e53bcefc15.tar.gz gcc-bc8642d6cef0782bc3181ade2ba577e53bcefc15.tar.bz2 | |
Round up the SSE register save area only if needed
There is is no point to round up the SSE register save area to 16 bytes if
the incoming stack boundary is less than 16 bytes.
* config/i386/i386.c (ix86_compute_frame_layout): Round up the
SSE register save area to 16 bytes only if the incoming stack
boundary is no less than 16 bytes.
From-SVN: r228621
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/config/i386/i386.c | 11 |
2 files changed, 14 insertions, 3 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 9f84b6e..4286491 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2015-10-08 H.J. Lu <hongjiu.lu@intel.com> + + * config/i386/i386.c (ix86_compute_frame_layout): Round up the + SSE register save area to 16 bytes only if the incoming stack + boundary is no less than 16 bytes. + 2015-10-08 Jeff Law <law@redhat.com> * tree-ssa-phiopt.c (factor_out_conversion): Add missing calls to diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index a24bd26..4806a7c 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -11383,9 +11383,14 @@ ix86_compute_frame_layout (struct ix86_frame *frame) if (frame->nsseregs) { /* The only ABI that has saved SSE registers (Win64) also has a - 16-byte aligned default stack, and thus we don't need to be - within the re-aligned local stack frame to save them. */ - offset = ROUND_UP (offset, 16); + 16-byte aligned default stack, and thus we don't need to be + within the re-aligned local stack frame to save them. In case + incoming stack boundary is aligned to less than 16 bytes, + unaligned move of SSE register will be emitted, so there is + no point to round up the SSE register save area outside the + re-aligned local stack frame to 16 bytes. */ + if (ix86_incoming_stack_boundary >= 128) + offset = ROUND_UP (offset, 16); offset += frame->nsseregs * 16; } frame->sse_reg_save_offset = offset; |