diff options
Diffstat (limited to 'src/mesa/drivers/dri/i965/brw_fs.cpp')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_fs.cpp | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp index aa9a80e248..a35687d599 100644 --- a/src/mesa/drivers/dri/i965/brw_fs.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs.cpp @@ -48,6 +48,7 @@ extern "C" { #include "../glsl/ir_optimization.h" #include "../glsl/ir_print_visitor.h" +#define MAX_INSTRUCTION (1 << 30) static struct brw_reg brw_reg_from_fs_reg(class fs_reg *reg); struct gl_shader * @@ -2750,7 +2751,7 @@ fs_visitor::calculate_live_intervals() return; for (int i = 0; i < num_vars; i++) { - def[i] = 1 << 30; + def[i] = MAX_INSTRUCTION; use[i] = -1; } @@ -3272,15 +3273,16 @@ fs_visitor::virtual_grf_interferes(int a, int b) int start = MAX2(this->virtual_grf_def[a], this->virtual_grf_def[b]); int end = MIN2(this->virtual_grf_use[a], this->virtual_grf_use[b]); - /* For dead code, just check if the def interferes with the other range. */ - if (this->virtual_grf_use[a] == -1) { - return (this->virtual_grf_def[a] >= this->virtual_grf_def[b] && - this->virtual_grf_def[a] < this->virtual_grf_use[b]); - } - if (this->virtual_grf_use[b] == -1) { - return (this->virtual_grf_def[b] >= this->virtual_grf_def[a] && - this->virtual_grf_def[b] < this->virtual_grf_use[a]); - } + /* We can't handle dead register writes here, without iterating + * over the whole instruction stream to find every single dead + * write to that register to compare to the live interval of the + * other register. Just assert that dead_code_eliminate() has been + * called. + */ + assert((this->virtual_grf_use[a] != -1 || + this->virtual_grf_def[a] == MAX_INSTRUCTION) && + (this->virtual_grf_use[b] != -1 || + this->virtual_grf_def[b] == MAX_INSTRUCTION)); return start < end; } |