From: Francisco Jerez Date: Fri, 22 Nov 2013 23:59:56 +0000 (-0800) Subject: i965: Have brw_imm_vf4() take the vector components as integer values. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=bbf8239f92ecd79431dfa41402e1c85318e7267f;p=mesa.git i965: Have brw_imm_vf4() take the vector components as integer values. Reviewed-by: Paul Berry --- diff --git a/src/mesa/drivers/dri/i965/brw_clip_util.c b/src/mesa/drivers/dri/i965/brw_clip_util.c index 263cfdcea85..10ec2667067 100644 --- a/src/mesa/drivers/dri/i965/brw_clip_util.c +++ b/src/mesa/drivers/dri/i965/brw_clip_util.c @@ -224,7 +224,7 @@ void brw_clip_interp_vertex( struct brw_clip_compile *c, vec1(t_nopersp), brw_imm_f(0)); brw_IF(p, BRW_EXECUTE_1); - brw_MOV(p, t_nopersp, brw_imm_vf4(VF_ONE, VF_ZERO, VF_ZERO, VF_ZERO)); + brw_MOV(p, t_nopersp, brw_imm_vf4(1, 0, 0, 0)); brw_ENDIF(p); /* Now compute t_nopersp = t_nopersp.y/t_nopersp.x and broadcast it. */ diff --git a/src/mesa/drivers/dri/i965/brw_reg.h b/src/mesa/drivers/dri/i965/brw_reg.h index f497366b444..a0de75ef63b 100644 --- a/src/mesa/drivers/dri/i965/brw_reg.h +++ b/src/mesa/drivers/dri/i965/brw_reg.h @@ -43,6 +43,7 @@ #define BRW_REG_H #include +#include "main/imports.h" #include "program/prog_instruction.h" #include "brw_defines.h" @@ -510,19 +511,38 @@ brw_imm_vf(unsigned v) return imm; } -#define VF_ZERO 0x0 -#define VF_ONE 0x30 -#define VF_NEG (1<<7) +/** + * Convert an integer into a "restricted" 8-bit float, used in vector + * immediates. The 8-bit floating point format has a sign bit, an + * excess-3 3-bit exponent, and a 4-bit mantissa. All integer values + * from -31 to 31 can be represented exactly. + */ +static inline uint8_t +int_to_float8(int x) +{ + if (x == 0) { + return 0; + } else if (x < 0) { + return 1 << 7 | int_to_float8(-x); + } else { + const unsigned exponent = _mesa_logbase2(x); + const unsigned mantissa = (x - (1 << exponent)) << (4 - exponent); + assert(exponent <= 4); + return (exponent + 3) << 4 | mantissa; + } +} +/** + * Construct a floating-point packed vector immediate from its integer + * values. \sa int_to_float8() + */ static inline struct brw_reg -brw_imm_vf4(unsigned v0, unsigned v1, unsigned v2, unsigned v3) +brw_imm_vf4(int v0, int v1, int v2, int v3) { - struct brw_reg imm = brw_imm_reg(BRW_REGISTER_TYPE_VF); - imm.vstride = BRW_VERTICAL_STRIDE_0; - imm.width = BRW_WIDTH_4; - imm.hstride = BRW_HORIZONTAL_STRIDE_1; - imm.dw1.ud = ((v0 << 0) | (v1 << 8) | (v2 << 16) | (v3 << 24)); - return imm; + return brw_imm_vf((int_to_float8(v0) << 0) | + (int_to_float8(v1) << 8) | + (int_to_float8(v2) << 16) | + (int_to_float8(v3) << 24)); }