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| author | David Schleef <ds@ginger.bigkitten.com> | 2008-05-16 21:10:21 -0700 |
|---|---|---|
| committer | David Schleef <ds@ginger.bigkitten.com> | 2008-05-16 21:10:21 -0700 |
| commit | abcbb3b826a3f00d1d87fb63500ad6204f8692a7 (patch) | |
| tree | c8477d321a08282ee5d87c2f2819389ba7db877c | |
| parent | 7653940717d0fadc8dd3157b624b66fc0210ca1a (diff) | |
| download | liboil-abcbb3b826a3f00d1d87fb63500ad6204f8692a7.tar.gz | |
[orc] keep track of registers that are used, in order to save/restore
only those registers
| -rw-r--r-- | orc/orcprogram-x86.c | 24 | ||||
| -rw-r--r-- | orc/orcprogram.c | 1 | ||||
| -rw-r--r-- | orc/orcprogram.h | 2 |
3 files changed, 21 insertions, 6 deletions
diff --git a/orc/orcprogram-x86.c b/orc/orcprogram-x86.c index 64b2381..16f1579 100644 --- a/orc/orcprogram-x86.c +++ b/orc/orcprogram-x86.c @@ -95,17 +95,29 @@ x86_emit_prologue (OrcProgram *program) g_print("test:\n"); x86_emit_push (program, 4, X86_EBP); x86_emit_mov_memoffset_reg (program, 4, 8, X86_ESP, X86_EBP); - x86_emit_push (program, 4, X86_EDI); - x86_emit_push (program, 4, X86_ESI); - x86_emit_push (program, 4, X86_EBX); + if (program->used_regs[x86_get_regnum(X86_EDI)]) { + x86_emit_push (program, 4, X86_EDI); + } + if (program->used_regs[x86_get_regnum(X86_ESI)]) { + x86_emit_push (program, 4, X86_ESI); + } + if (program->used_regs[x86_get_regnum(X86_EBX)]) { + x86_emit_push (program, 4, X86_EBX); + } } void x86_emit_epilogue (OrcProgram *program) { - x86_emit_pop (program, 4, X86_EBX); - x86_emit_pop (program, 4, X86_ESI); - x86_emit_pop (program, 4, X86_EDI); + if (program->used_regs[x86_get_regnum(X86_EBX)]) { + x86_emit_pop (program, 4, X86_EBX); + } + if (program->used_regs[x86_get_regnum(X86_ESI)]) { + x86_emit_pop (program, 4, X86_ESI); + } + if (program->used_regs[x86_get_regnum(X86_EDI)]) { + x86_emit_pop (program, 4, X86_EDI); + } x86_emit_pop (program, 4, X86_EBP); x86_emit_ret (program); } diff --git a/orc/orcprogram.c b/orc/orcprogram.c index 591902d..a0244bc 100644 --- a/orc/orcprogram.c +++ b/orc/orcprogram.c @@ -207,6 +207,7 @@ orc_program_rewrite_vars (OrcProgram *program) if (!alloc[k]) { program->vars[i].alloc = k + ORC_GP_REG_BASE; alloc[k] = 1; + program->used_regs[k] = 1; break; } } diff --git a/orc/orcprogram.h b/orc/orcprogram.h index 2ef5671..42eb1a4 100644 --- a/orc/orcprogram.h +++ b/orc/orcprogram.h @@ -102,6 +102,8 @@ struct _OrcProgram { unsigned char *labels[100]; int error; + + int used_regs[8]; }; struct _OrcExecutor { |