From 67bbaddf7d8eef7eb2b2ab3944a1a4a86d16bded Mon Sep 17 00:00:00 2001 From: Alyssa Rosenzweig Date: Sun, 1 Mar 2020 11:51:01 -0500 Subject: [PATCH] pan/bi: Move notes on ADD ops to notes file Again, we'd like to see just the opcode table more clearly. Signed-off-by: Alyssa Rosenzweig Part-of: --- src/panfrost/bifrost/Notes.txt | 81 +++++++++++++++++++++++++++++++++++++- src/panfrost/bifrost/disassemble.c | 43 -------------------- 2 files changed, 80 insertions(+), 44 deletions(-) diff --git a/src/panfrost/bifrost/Notes.txt b/src/panfrost/bifrost/Notes.txt index 53714ac..5c06edc 100644 --- a/src/panfrost/bifrost/Notes.txt +++ b/src/panfrost/bifrost/Notes.txt @@ -1,6 +1,6 @@ # Notes on opcodes -_Notes by Connor Abbott extracted from the disassembler_ +_Notes mainly by Connor Abbott extracted from the disassembler_ LOG_FREXPM: @@ -99,3 +99,82 @@ LSHIFT_ADD_LOW32: // ld_st_op temp, ptr.y, ... // // Again, the same as the unsigned case except for the offset. + +--- + +ADD ops.. + +F16_TO_F32.X: // take the low 16 bits, and expand it to a 32-bit float +F16_TO_F32.Y: // take the high 16 bits, and expand it to a 32-bit float + +MOV: + // Logically, this should be SWZ.XY, but that's equivalent to a move, and + // this seems to be the canonical way the blob generates a MOV. + + +FRCP_FREXPM: + // Given a floating point number m * 2^e, returns m ^ 2^{-1}. + +FLOG_FREXPE: + // From the ARM patent US20160364209A1: + // "Decompose v (the input) into numbers x1 and s such that v = x1 * 2^s, + // and x1 is a floating point value in a predetermined range where the + // value 1 is within the range and not at one extremity of the range (e.g. + // choose a range where 1 is towards middle of range)." + // + // This computes s. + +LD_UBO.v4i32 + // src0 = offset, src1 = binding + +FRCP_FAST.f32: + // *_FAST does not exist on G71 (added to G51, G72, and everything after) + +FRCP_TABLE + // Given a floating point number m * 2^e, produces a table-based + // approximation of 2/m using the top 17 bits. Includes special cases for + // infinity, NaN, and zero, and copies the sign bit. + +FRCP_FAST.f16.X + // Exists on G71 + +FRSQ_TABLE: + // A similar table for inverse square root, using the high 17 bits of the + // mantissa as well as the low bit of the exponent. + +FRCP_APPROX: + // Used in the argument reduction for log. Given a floating-point number + // m * 2^e, uses the top 4 bits of m to produce an approximation to 1/m + // with the exponent forced to 0 and only the top 5 bits are nonzero. 0, + // infinity, and NaN all return 1.0. + // See the ARM patent for more information. + +MUX: + // For each bit i, return src2[i] ? src0[i] : src1[i]. In other words, this + // is the same as (src2 & src0) | (~src2 & src1). + +ST_VAR: + // store a varying given the address and datatype from LD_VAR_ADDR + +LD_VAR_ADDR: + // Compute varying address and datatype (for storing in the vertex shader), + // and store the vec3 result in the data register. The result is passed as + // the 3 normal arguments to ST_VAR. + +DISCARD + // Conditional discards (discard_if) in NIR. Compares the first two + // sources and discards if the result is true + +ATEST.f32: + // Implements alpha-to-coverage, as well as possibly the late depth and + // stencil tests. The first source is the existing sample mask in R60 + // (possibly modified by gl_SampleMask), and the second source is the alpha + // value. The sample mask is written right away based on the + // alpha-to-coverage result using the normal register write mechanism, + // since that doesn't need to read from any memory, and then written again + // later based on the result of the stencil and depth tests using the + // special register. + +BLEND: + // This takes the sample coverage mask (computed by ATEST above) as a + // regular argument, in addition to the vec4 color in the special register. diff --git a/src/panfrost/bifrost/disassemble.c b/src/panfrost/bifrost/disassemble.c index 94bdd25..c7ad052 100644 --- a/src/panfrost/bifrost/disassemble.c +++ b/src/panfrost/bifrost/disassemble.c @@ -1108,30 +1108,18 @@ static const struct add_op_info add_op_infos[] = { { 0x0799d, "U16_TO_F32.X", ADD_ONE_SRC }, { 0x0799e, "I16_TO_F32.Y", ADD_ONE_SRC }, { 0x0799f, "U16_TO_F32.Y", ADD_ONE_SRC }, - // take the low 16 bits, and expand it to a 32-bit float { 0x079a2, "F16_TO_F32.X", ADD_ONE_SRC }, - // take the high 16 bits, ... { 0x079a3, "F16_TO_F32.Y", ADD_ONE_SRC }, { 0x07b2b, "SWZ.YX.v2i16", ADD_ONE_SRC }, { 0x07b2c, "NOP", ADD_ONE_SRC }, { 0x07b29, "SWZ.XX.v2i16", ADD_ONE_SRC }, - // Logically, this should be SWZ.XY, but that's equivalent to a move, and - // this seems to be the canonical way the blob generates a MOV. { 0x07b2d, "MOV", ADD_ONE_SRC }, { 0x07b2f, "SWZ.YY.v2i16", ADD_ONE_SRC }, - // Given a floating point number m * 2^e, returns m ^ 2^{-1}. { 0x07b65, "FRCP_FREXPM", ADD_ONE_SRC }, { 0x07b75, "FSQRT_FREXPM", ADD_ONE_SRC }, { 0x07b8d, "FRCP_FREXPE", ADD_ONE_SRC }, { 0x07ba5, "FSQRT_FREXPE", ADD_ONE_SRC }, { 0x07bad, "FRSQ_FREXPE", ADD_ONE_SRC }, - // From the ARM patent US20160364209A1: - // "Decompose v (the input) into numbers x1 and s such that v = x1 * 2^s, - // and x1 is a floating point value in a predetermined range where the - // value 1 is within the range and not at one extremity of the range (e.g. - // choose a range where 1 is towards middle of range)." - // - // This computes s. { 0x07bc5, "FLOG_FREXPE", ADD_ONE_SRC }, { 0x07d45, "CEIL", ADD_ONE_SRC }, { 0x07d85, "FLOOR", ADD_ONE_SRC }, @@ -1162,7 +1150,6 @@ static const struct add_op_info add_op_infos[] = { { 0x0c1e0, "LD_UBO.v2i32", ADD_TWO_SRC, true }, { 0x0c1f8, "LD_SCRATCH.v2i32", ADD_TWO_SRC, true }, { 0x0c208, "LOAD.v4i32", ADD_TWO_SRC, true }, - // src0 = offset, src1 = binding { 0x0c220, "LD_UBO.v4i32", ADD_TWO_SRC, true }, { 0x0c238, "LD_SCRATCH.v4i32", ADD_TWO_SRC, true }, { 0x0c248, "STORE.v4i32", ADD_TWO_SRC, true }, @@ -1177,25 +1164,13 @@ static const struct add_op_info add_op_infos[] = { { 0x0cab8, "LD_SCRATCH.v3i32", ADD_TWO_SRC, true }, { 0x0cb88, "STORE.v3i32", ADD_TWO_SRC, true }, { 0x0cbb8, "ST_SCRATCH.v3i32", ADD_TWO_SRC, true }, - // *_FAST does not exist on G71 (added to G51, G72, and everything after) { 0x0cc00, "FRCP_FAST.f32", ADD_ONE_SRC }, { 0x0cc20, "FRSQ_FAST.f32", ADD_ONE_SRC }, - // Given a floating point number m * 2^e, produces a table-based - // approximation of 2/m using the top 17 bits. Includes special cases for - // infinity, NaN, and zero, and copies the sign bit. { 0x0ce00, "FRCP_TABLE", ADD_ONE_SRC }, - // Exists on G71 { 0x0ce10, "FRCP_FAST.f16.X", ADD_ONE_SRC }, - // A similar table for inverse square root, using the high 17 bits of the - // mantissa as well as the low bit of the exponent. { 0x0ce20, "FRSQ_TABLE", ADD_ONE_SRC }, { 0x0ce30, "FRCP_FAST.f16.Y", ADD_ONE_SRC }, { 0x0ce50, "FRSQ_FAST.f16.X", ADD_ONE_SRC }, - // Used in the argument reduction for log. Given a floating-point number - // m * 2^e, uses the top 4 bits of m to produce an approximation to 1/m - // with the exponent forced to 0 and only the top 5 bits are nonzero. 0, - // infinity, and NaN all return 1.0. - // See the ARM patent for more information. { 0x0ce60, "FRCP_APPROX", ADD_ONE_SRC }, { 0x0ce70, "FRSQ_FAST.f16.Y", ADD_ONE_SRC }, { 0x0cf40, "ATAN_ASSIST", ADD_TWO_SRC }, @@ -1206,8 +1181,6 @@ static const struct add_op_info add_op_infos[] = { { 0x0cf60, "FLOG2_TABLE", ADD_ONE_SRC }, { 0x0cf64, "FLOGE_TABLE", ADD_ONE_SRC }, { 0x0d000, "BRANCH", ADD_BRANCH }, - // For each bit i, return src2[i] ? src0[i] : src1[i]. In other words, this - // is the same as (src2 & src0) | (~src2 & src1). { 0x0e8c0, "MUX", ADD_THREE_SRC }, { 0x0e9b0, "ATAN_LDEXP.Y.f32", ADD_TWO_SRC }, { 0x0e9b8, "ATAN_LDEXP.X.f32", ADD_TWO_SRC }, @@ -1240,38 +1213,22 @@ static const struct add_op_info add_op_infos[] = { { 0x17d90, "ADD.i32.u16.X", ADD_TWO_SRC }, { 0x17dc0, "ADD.i32.i16.Y", ADD_TWO_SRC }, { 0x17dd0, "ADD.i32.u16.Y", ADD_TWO_SRC }, - // Compute varying address and datatype (for storing in the vertex shader), - // and store the vec3 result in the data register. The result is passed as - // the 3 normal arguments to ST_VAR. { 0x18000, "LD_VAR_ADDR.f16", ADD_VARYING_ADDRESS, true }, { 0x18100, "LD_VAR_ADDR.f32", ADD_VARYING_ADDRESS, true }, { 0x18200, "LD_VAR_ADDR.i32", ADD_VARYING_ADDRESS, true }, { 0x18300, "LD_VAR_ADDR.u32", ADD_VARYING_ADDRESS, true }, - // Conditional discards (discard_if) in NIR. Compares the first two - // sources and discards if the result is true { 0x19181, "DISCARD.FEQ.f32", ADD_TWO_SRC, true }, { 0x19189, "DISCARD.FNE.f32", ADD_TWO_SRC, true }, { 0x1918C, "DISCARD.GL.f32", ADD_TWO_SRC, true }, /* Consumes ICMP.GL/etc with fixed 0 argument */ { 0x19190, "DISCARD.FLE.f32", ADD_TWO_SRC, true }, { 0x19198, "DISCARD.FLT.f32", ADD_TWO_SRC, true }, - // Implements alpha-to-coverage, as well as possibly the late depth and - // stencil tests. The first source is the existing sample mask in R60 - // (possibly modified by gl_SampleMask), and the second source is the alpha - // value. The sample mask is written right away based on the - // alpha-to-coverage result using the normal register write mechanism, - // since that doesn't need to read from any memory, and then written again - // later based on the result of the stencil and depth tests using the - // special register. { 0x191e8, "ATEST.f32", ADD_TWO_SRC, true }, { 0x191f0, "ATEST.X.f16", ADD_TWO_SRC, true }, { 0x191f8, "ATEST.Y.f16", ADD_TWO_SRC, true }, - // store a varying given the address and datatype from LD_VAR_ADDR { 0x19300, "ST_VAR.v1", ADD_THREE_SRC, true }, { 0x19340, "ST_VAR.v2", ADD_THREE_SRC, true }, { 0x19380, "ST_VAR.v3", ADD_THREE_SRC, true }, { 0x193c0, "ST_VAR.v4", ADD_THREE_SRC, true }, - // This takes the sample coverage mask (computed by ATEST above) as a - // regular argument, in addition to the vec4 color in the special register. { 0x1952c, "BLEND", ADD_BLENDING, true }, { 0x1a000, "LD_VAR.16", ADD_VARYING_INTERP, true }, { 0x1ae60, "TEX", ADD_TEX, true }, -- 2.7.4