diff options
| author | Cherry Zhang <cherryyz@google.com> | 2016-08-30 14:46:25 -0400 |
|---|---|---|
| committer | Cherry Zhang <cherryyz@google.com> | 2016-08-30 23:16:17 +0000 |
| commit | f9dafc742d7c0e892b6e4ff17cb9ec7165887e44 (patch) | |
| tree | db0e07eccf2addc770143a7e3c7e389cb5a52d2a /src/cmd/internal/obj/mips | |
| parent | b2e0e9688a512970ea8d270238c8ff3bbf85cbe1 (diff) | |
| download | go-f9dafc742d7c0e892b6e4ff17cb9ec7165887e44.tar.xz | |
cmd/compile, runtime, etc: get rid of constant FP registers
On ARM64, MIPS64, and PPC64, some floating point registers were
reserved for constants 0, 1, 2, 0.5, etc. This CL removes them.
On ARM64, they are never used. On MIPS64 and PPC64, the only use
case is a multiplication-by-2 in the old backend of the compiler,
which is replaced with an addition.
Change-Id: I737cbf43283756e3408964fc88c567a938c57036
Reviewed-on: https://go-review.googlesource.com/28095
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Diffstat (limited to 'src/cmd/internal/obj/mips')
| -rw-r--r-- | src/cmd/internal/obj/mips/a.out.go | 28 |
1 files changed, 12 insertions, 16 deletions
diff --git a/src/cmd/internal/obj/mips/a.out.go b/src/cmd/internal/obj/mips/a.out.go index bc6b69df8d..eab65dda51 100644 --- a/src/cmd/internal/obj/mips/a.out.go +++ b/src/cmd/internal/obj/mips/a.out.go @@ -185,22 +185,18 @@ const ( REG_SPECIAL = REG_M0 - REGZERO = REG_R0 /* set to zero */ - REGSP = REG_R29 - REGSB = REG_R28 - REGLINK = REG_R31 - REGRET = REG_R1 - REGARG = -1 /* -1 disables passing the first argument in register */ - REGRT1 = REG_R1 /* reserved for runtime, duffzero and duffcopy */ - REGRT2 = REG_R2 /* reserved for runtime, duffcopy */ - REGCTXT = REG_R22 /* context for closures */ - REGG = REG_R30 /* G */ - REGTMP = REG_R23 /* used by the linker */ - FREGRET = REG_F0 - FREGZERO = REG_F24 /* both float and double */ - FREGHALF = REG_F26 /* double */ - FREGONE = REG_F28 /* double */ - FREGTWO = REG_F30 /* double */ + REGZERO = REG_R0 /* set to zero */ + REGSP = REG_R29 + REGSB = REG_R28 + REGLINK = REG_R31 + REGRET = REG_R1 + REGARG = -1 /* -1 disables passing the first argument in register */ + REGRT1 = REG_R1 /* reserved for runtime, duffzero and duffcopy */ + REGRT2 = REG_R2 /* reserved for runtime, duffcopy */ + REGCTXT = REG_R22 /* context for closures */ + REGG = REG_R30 /* G */ + REGTMP = REG_R23 /* used by the linker */ + FREGRET = REG_F0 ) const ( |