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nouveau: codegen: LOAD: Take src swizzle into account

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The llvm TGSI backend uses pointers in registers and does things
like:

LOAD TEMP[0].y, MEMORY[0], TEMP[0]

Expecting the data at address TEMP[0].x to get loaded to
TEMP[0].y. But this will cause the data at TEMP[0].x + 4 to be
loaded instead.

This commit adds support for a swizzle suffix for the 1st source
operand, which allows using:

LOAD TEMP[0].y, MEMORY[0].xxxx, TEMP[0]

And actually getting the desired behavior

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
This commit is contained in:
Hans de Goede
2016-03-31 08:53:40 +02:00
parent 90f45357ab
commit b5e7907f30
2 changed files with 9 additions and 2 deletions
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3
src/gallium/docs/source/tgsi.rst
View File

@@ -2288,6 +2288,9 @@ Resource Access Opcodes
texture arrays and 2D textures. address.w is always
ignored.
A swizzle suffix may be added to the resource argument
this will cause the resource data to be swizzled accordingly.
.. opcode:: STORE - Write data to a shader resource
Syntax: ``STORE resource, address, src``

8
src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
View File

@@ -2385,14 +2385,18 @@ Converter::handleLOAD(Value *dst0[4])
Value *off;
Symbol *sym;
uint32_t src0_component_offset = tgsi.getSrc(0).getSwizzle(c) * 4;
if (tgsi.getSrc(1).getFile() == TGSI_FILE_IMMEDIATE) {
off = NULL;
sym = makeSym(tgsi.getSrc(0).getFile(), r, -1, c,
tgsi.getSrc(1).getValueU32(0, info) + 4 * c);
tgsi.getSrc(1).getValueU32(0, info) +
src0_component_offset);
} else {
// yzw are ignored for buffers
off = fetchSrc(1, 0);
sym = makeSym(tgsi.getSrc(0).getFile(), r, -1, c, 4 * c);
sym = makeSym(tgsi.getSrc(0).getFile(), r, -1, c,
src0_component_offset);
}
Instruction *ld = mkLoad(TYPE_U32, dst0[c], sym, off);