From: Eric Anholt Date: Tue, 9 Mar 2010 19:56:14 +0000 (-0800) Subject: i965: Unalias all GLSL source regs from the destination regs used. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6b194dab6b4d9f12cdd54c699b23c0d3420a49c2;p=mesa.git i965: Unalias all GLSL source regs from the destination regs used. We were doing it ad-hoc before, as instructions with potential aliasing problems were identified. But thanks to swizzling basically anything can have aliasing, so just do it generally at source reg setup time. This is somewhat inefficient, because sometimes an operation doesn't need unaliasing protection if the swizzling is safe, but the unaliasing before didn't cover those cases either. Fixes piglit glsl-fs-loop. --- diff --git a/src/mesa/drivers/dri/i965/brw_wm_glsl.c b/src/mesa/drivers/dri/i965/brw_wm_glsl.c index 562608e2ecd..13306accda7 100644 --- a/src/mesa/drivers/dri/i965/brw_wm_glsl.c +++ b/src/mesa/drivers/dri/i965/brw_wm_glsl.c @@ -614,112 +614,6 @@ static void invoke_subroutine( struct brw_wm_compile *c, } } -/* Workaround for using brw_wm_emit.c's emit functions, which expect - * destination regs to be uniquely written. Moves arguments out to - * temporaries as necessary for instructions which use their destination as - * a temporary. - */ -static void -unalias3(struct brw_wm_compile *c, - void (*func)(struct brw_compile *c, - const struct brw_reg *dst, - GLuint mask, - const struct brw_reg *arg0, - const struct brw_reg *arg1, - const struct brw_reg *arg2), - const struct brw_reg *dst, - GLuint mask, - const struct brw_reg *arg0, - const struct brw_reg *arg1, - const struct brw_reg *arg2) -{ - struct brw_compile *p = &c->func; - struct brw_reg tmp_arg0[4], tmp_arg1[4], tmp_arg2[4]; - int i, j; - int mark = mark_tmps(c); - - for (j = 0; j < 4; j++) { - tmp_arg0[j] = arg0[j]; - tmp_arg1[j] = arg1[j]; - tmp_arg2[j] = arg2[j]; - } - - for (i = 0; i < 4; i++) { - if (mask & (1<func; - struct brw_reg tmp_arg0[4], tmp_arg1[4]; - int i, j; - int mark = mark_tmps(c); - - for (j = 0; j < 4; j++) { - tmp_arg0[j] = arg0[j]; - tmp_arg1[j] = arg1[j]; - } - - for (i = 0; i < 4; i++) { - if (mask & (1<func; + int i, j; for (i = 0; i < 4; i++) { - if (mask & (1 << i)) + if (mask & (1 << i)) { regs[i] = get_src_reg(c, inst, index, i); + + /* Unalias destination registers from our sources. */ + if (regs[i].file == BRW_GENERAL_REGISTER_FILE) { + for (j = 0; j < 4; j++) { + if (memcmp(®s[i], &dst[j], sizeof(regs[0])) == 0) { + struct brw_reg tmp = alloc_tmp(c); + brw_MOV(p, tmp, regs[i]); + regs[i] = tmp; + break; + } + } + } + } } } @@ -1845,6 +1754,7 @@ static void brw_wm_emit_glsl(struct brw_context *brw, struct brw_wm_compile *c) int dst_flags; struct brw_reg args[3][4], dst[4]; int j; + int mark = mark_tmps( c ); c->cur_inst = i; @@ -1866,7 +1776,7 @@ static void brw_wm_emit_glsl(struct brw_context *brw, struct brw_wm_compile *c) } } for (j = 0; j < brw_wm_nr_args(inst->Opcode); j++) - get_argument_regs(c, inst, j, args[j], WRITEMASK_XYZW); + get_argument_regs(c, inst, j, dst, args[j], WRITEMASK_XYZW); dst_flags = inst->DstReg.WriteMask; if (inst->SaturateMode == SATURATE_ZERO_ONE) @@ -1920,8 +1830,7 @@ static void brw_wm_emit_glsl(struct brw_context *brw, struct brw_wm_compile *c) emit_alu1(p, brw_RNDD, dst, dst_flags, args[0]); break; case OPCODE_LRP: - unalias3(c, emit_lrp, - dst, dst_flags, args[0], args[1], args[2]); + emit_lrp(p, dst, dst_flags, args[0], args[1], args[2]); break; case OPCODE_TRUNC: emit_alu1(p, brw_RNDZ, dst, dst_flags, args[0]); @@ -1961,10 +1870,10 @@ static void brw_wm_emit_glsl(struct brw_context *brw, struct brw_wm_compile *c) emit_math1(c, BRW_MATH_FUNCTION_LOG, dst, dst_flags, args[0]); break; case OPCODE_MIN: - unalias2(c, emit_min, dst, dst_flags, args[0], args[1]); + emit_min(p, dst, dst_flags, args[0], args[1]); break; case OPCODE_MAX: - unalias2(c, emit_max, dst, dst_flags, args[0], args[1]); + emit_max(p, dst, dst_flags, args[0], args[1]); break; case OPCODE_DDX: case OPCODE_DDY: @@ -2119,6 +2028,9 @@ static void brw_wm_emit_glsl(struct brw_context *brw, struct brw_wm_compile *c) inst->Opcode); } + /* Release temporaries containing any unaliased source regs. */ + release_tmps( c, mark ); + if (inst->CondUpdate) brw_set_predicate_control(p, BRW_PREDICATE_NORMAL); else