diff options
| author | segher <segher@138bc75d-0d04-0410-961f-82ee72b054a4> | 2019-03-24 20:26:53 +0000 |
|---|---|---|
| committer | segher <segher@138bc75d-0d04-0410-961f-82ee72b054a4> | 2019-03-24 20:26:53 +0000 |
| commit | 74ddff9ad7273bbe0367b6e0fb178a5400584119 (patch) | |
| tree | f9ec455a6faac629af01a9bab47c4cbf8836633f /gcc/config | |
| parent | 3f056acb886bb32ac9e048ca50f37c9da8ac5ccd (diff) | |
rs6000: Make CSE'ing __tls_get_addr calls possible
CSE does not consider calls, not even const calls. This patch puts a
REG_EQUAL note on the pseudo we assign the __tls_get_addr result to,
so that those pseudos can be CSE'd and the extra calls deleted as dead
code.
CSE should really handle const calls directly, but it is stage 4.
* config/rs6000/rs6000.c (rs6000_legitimize_tls_address): Add REG_EQUAL
notes for the result of the __tls_get_addr calls.
* config/rs6000/rs6000.md (unspec UNSPEC_TLS_GET_ADDR): New.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@269902 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/rs6000/rs6000.c | 10 | ||||
| -rw-r--r-- | gcc/config/rs6000/rs6000.md | 1 |
2 files changed, 11 insertions, 0 deletions
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c index 734c3860ffe..06ce2892bf9 100644 --- a/gcc/config/rs6000/rs6000.c +++ b/gcc/config/rs6000/rs6000.c @@ -8785,6 +8785,11 @@ rs6000_legitimize_tls_address (rtx addr, enum tls_model model) else emit_library_call_value (tga, dest, LCT_CONST, Pmode); global_tlsarg = NULL_RTX; + + /* Make a note so that the result of this call can be CSEd. */ + rtvec vec = gen_rtvec (1, copy_rtx (arg)); + rtx uns = gen_rtx_UNSPEC (Pmode, vec, UNSPEC_TLS_GET_ADDR); + set_unique_reg_note (get_last_insn (), REG_EQUAL, uns); } else if (model == TLS_MODEL_LOCAL_DYNAMIC) { @@ -8803,6 +8808,11 @@ rs6000_legitimize_tls_address (rtx addr, enum tls_model model) emit_library_call_value (tga, tmp1, LCT_CONST, Pmode); global_tlsarg = NULL_RTX; + /* Make a note so that the result of this call can be CSEd. */ + rtvec vec = gen_rtvec (1, copy_rtx (arg)); + rtx uns = gen_rtx_UNSPEC (Pmode, vec, UNSPEC_TLS_GET_ADDR); + set_unique_reg_note (get_last_insn (), REG_EQUAL, uns); + if (rs6000_tls_size == 16) { if (TARGET_64BIT) diff --git a/gcc/config/rs6000/rs6000.md b/gcc/config/rs6000/rs6000.md index 297b884f648..b8dd85905f3 100644 --- a/gcc/config/rs6000/rs6000.md +++ b/gcc/config/rs6000/rs6000.md @@ -79,6 +79,7 @@ UNSPEC_MPIC_CORRECT ; macho_correct_pic UNSPEC_TLSGD UNSPEC_TLSLD + UNSPEC_TLS_GET_ADDR UNSPEC_MOVESI_FROM_CR UNSPEC_MOVESI_TO_CR UNSPEC_TLSDTPREL |