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| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/config/i386/i386.c | 10 |
2 files changed, 16 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 43c3455..acdcd91 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,11 @@ 2019-09-30 Richard Sandiford <richard.sandiford@arm.com> + * config/i386/i386.c: Include function-abi.h. + (ix86_avx_u128_mode_needed): Treat function calls as AVX_U128_ANY + if they preserve some 256-bit or 512-bit SSE registers. + +2019-09-30 Richard Sandiford <richard.sandiford@arm.com> + * target.def (insn_callee_abi): New hook. (remove_extra_call_preserved_regs): Delete. * doc/tm.texi.in (TARGET_INSN_CALLEE_ABI): New macro. diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 9a87413..a13aef8 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -95,6 +95,7 @@ along with GCC; see the file COPYING3. If not see #include "i386-builtins.h" #include "i386-expand.h" #include "i386-features.h" +#include "function-abi.h" /* This file should be included last. */ #include "target-def.h" @@ -13511,6 +13512,15 @@ ix86_avx_u128_mode_needed (rtx_insn *insn) } } + /* If the function is known to preserve some SSE registers, + RA and previous passes can legitimately rely on that for + modes wider than 256 bits. It's only safe to issue a + vzeroupper if all SSE registers are clobbered. */ + const function_abi &abi = insn_callee_abi (insn); + if (!hard_reg_set_subset_p (reg_class_contents[ALL_SSE_REGS], + abi.mode_clobbers (V4DImode))) + return AVX_U128_ANY; + return AVX_U128_CLEAN; } |