From 96620d2275894d1e021d403c0e40007c61269563 Mon Sep 17 00:00:00 2001 From: Tom Stellard Date: Thu, 15 Sep 2011 18:24:55 -0700 Subject: r300/compiler: Don't unroll loops that conditionally increment the counter --- src/gallium/drivers/r300/compiler/radeon_emulate_loops.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) (limited to 'src/gallium/drivers') diff --git a/src/gallium/drivers/r300/compiler/radeon_emulate_loops.c b/src/gallium/drivers/r300/compiler/radeon_emulate_loops.c index 205eecd1129..8c46db08093 100644 --- a/src/gallium/drivers/r300/compiler/radeon_emulate_loops.c +++ b/src/gallium/drivers/r300/compiler/radeon_emulate_loops.c @@ -51,6 +51,7 @@ struct count_inst { rc_swizzle Swz; float Amount; int Unknown; + unsigned BranchDepth; }; static float get_constant_value(struct radeon_compiler * c, @@ -141,6 +142,14 @@ static void get_incr_amount(void * data, struct rc_instruction * inst, (1 << GET_SWZ(count_inst->Swz,0) != mask)){ return; } + + /* XXX: Give up if the counter is modified within an IF block. We + * could handle this case with better analysis. */ + if (count_inst->BranchDepth > 0) { + count_inst->Unknown = 1; + return; + } + /* Find the index of the counter register. */ opcode = rc_get_opcode_info(inst->U.I.Opcode); if(opcode->NumSrcRegs != 2){ @@ -236,6 +245,7 @@ static int try_unroll_loop(struct radeon_compiler * c, struct loop_info * loop) count_inst.Swz = counter->Swizzle; count_inst.Amount = 0.0f; count_inst.Unknown = 0; + count_inst.BranchDepth = 0; end_loops = 1; for(inst = loop->BeginLoop->Next; end_loops > 0; inst = inst->Next){ switch(inst->U.I.Opcode){ @@ -258,9 +268,11 @@ static int try_unroll_loop(struct radeon_compiler * c, struct loop_info * loop) return 0; } break; - /* XXX Check if the counter is modified within an if statement. - */ case RC_OPCODE_IF: + count_inst.BranchDepth++; + break; + case RC_OPCODE_ENDIF: + count_inst.BranchDepth--; break; default: rc_for_all_writes_mask(inst, get_incr_amount, &count_inst); -- cgit v1.2.3