Module: Mesa Branch: master Commit: d88aa6fe3e9e08af332a900c69bf2bf5c4420e90 URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=d88aa6fe3e9e08af332a900c69bf2bf5c4420e90
Author: Eric Anholt <[email protected]> Date: Mon Dec 13 15:18:13 2010 -0800 i965: Improve the hacks for ARB_fp scalar^scalar POW on gen6. This is still awful, but my ability to care about reworking the old backend so we can just get a temporary value into a POW is awfully low since the new backend does this all sensibly. Fixes: fp1-LIT test 1 fp1-LIT test 3 (case x < 0) fp1-POW test (exponentiation) fp-lit-mask --- src/mesa/drivers/dri/i965/brw_wm_emit.c | 53 ++++++++++--------------------- 1 files changed, 17 insertions(+), 36 deletions(-) diff --git a/src/mesa/drivers/dri/i965/brw_wm_emit.c b/src/mesa/drivers/dri/i965/brw_wm_emit.c index a8be106..be86e0e 100644 --- a/src/mesa/drivers/dri/i965/brw_wm_emit.c +++ b/src/mesa/drivers/dri/i965/brw_wm_emit.c @@ -973,34 +973,23 @@ void emit_math2(struct brw_wm_compile *c, struct brw_reg temp_dst = dst[dst_chan]; if (arg0[0].hstride == BRW_HORIZONTAL_STRIDE_0) { - if (arg1[0].hstride == BRW_HORIZONTAL_STRIDE_0) { - /* Both scalar arguments. Do scalar calc. */ - src0.hstride = BRW_HORIZONTAL_STRIDE_1; - src1.hstride = BRW_HORIZONTAL_STRIDE_1; - temp_dst.hstride = BRW_HORIZONTAL_STRIDE_1; - temp_dst.width = BRW_WIDTH_1; - - if (arg0[0].subnr != 0) { - brw_MOV(p, temp_dst, src0); - src0 = temp_dst; - - /* Ouch. We've used the temp as a dst, and we still - * need a temp to store arg1 in, because src and dst - * offsets have to be equal. Leaving this up to - * glsl2-965 to handle correctly. - */ - assert(arg1[0].subnr == 0); - } else if (arg1[0].subnr != 0) { - brw_MOV(p, temp_dst, src1); - src1 = temp_dst; - } - } else { - brw_MOV(p, temp_dst, src0); - src0 = temp_dst; - } - } else if (arg1[0].hstride == BRW_HORIZONTAL_STRIDE_0) { - brw_MOV(p, temp_dst, src1); - src1 = temp_dst; + brw_MOV(p, temp_dst, src0); + src0 = temp_dst; + } + + if (arg1[0].hstride == BRW_HORIZONTAL_STRIDE_0) { + /* This is a heinous hack to get a temporary register for use + * in case both arg0 and arg1 are constants. Why you're + * doing exponentiation on constant values in the shader, we + * don't know. + * + * max_wm_grf is almost surely less than the maximum GRF, and + * gen6 doesn't care about the number of GRFs used in a + * shader like pre-gen6 did. + */ + struct brw_reg temp = brw_vec8_grf(c->max_wm_grf, 0); + brw_MOV(p, temp, src1); + src1 = temp; } brw_set_saturate(p, (mask & SATURATE) ? 1 : 0); @@ -1018,14 +1007,6 @@ void emit_math2(struct brw_wm_compile *c, sechalf(src0), sechalf(src1)); } - - /* Splat a scalar result into all the channels. */ - if (arg0[0].hstride == BRW_HORIZONTAL_STRIDE_0 && - arg1[0].hstride == BRW_HORIZONTAL_STRIDE_0) { - temp_dst.hstride = BRW_HORIZONTAL_STRIDE_0; - temp_dst.vstride = BRW_VERTICAL_STRIDE_0; - brw_MOV(p, dst[dst_chan], temp_dst); - } } else { GLuint saturate = ((mask & SATURATE) ? BRW_MATH_SATURATE_SATURATE : _______________________________________________ mesa-commit mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/mesa-commit
