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radeon/llvm: Declare the interpolation intrinsics as ReadOnly

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This signals to the Dead Code Elimination pass that it is safe to
remove these instructions when they are dead.
This commit is contained in:
Tom Stellard 2012-08-29 09:58:28 -04:00
parent 73a2c4b9db
commit cf4ac69928
3 changed files with 4 additions and 3 deletions
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1
src/gallium/drivers/radeon/SIInstrInfo.td
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@ -364,6 +364,7 @@ class VINTRP <bits <2> op, dag outs, dag ins, string asm, list<dag> pattern> :
let EncodingType = 11; // SIInstrEncodingType::VINTRP
let Uses = [M0];
let neverHasSideEffects = 1;
}
class VOP1 <bits<8> op, dag outs, dag ins, string asm, list<dag> pattern> :

2
src/gallium/drivers/radeon/SIIntrinsics.td
View file

@ -26,7 +26,7 @@ let TargetPrefix = "SI", isTarget = 1 in {
/* Interpolation Intrinsics */
def int_SI_set_M0 : Intrinsic <[llvm_i32_ty], [llvm_i32_ty]>;
class Interp : Intrinsic <[llvm_float_ty], [llvm_i32_ty, llvm_i32_ty, llvm_i32_ty], []>;
class Interp : Intrinsic <[llvm_float_ty], [llvm_i32_ty, llvm_i32_ty, llvm_i32_ty], [IntrReadMem]>;
def int_SI_fs_interp_linear_center : Interp;
def int_SI_fs_interp_linear_centroid : Interp;

4
src/gallium/drivers/radeonsi/radeonsi_shader.c
View file

@ -329,8 +329,8 @@ static void declare_input_fs(
args[1] = attr_number;
args[2] = params;
si_shader_ctx->radeon_bld.inputs[soa_index] =
lp_build_intrinsic(gallivm->builder, intr_name,
input_type, args, 3);
build_intrinsic(base->gallivm->builder, intr_name,
input_type, args, 3, LLVMReadOnlyAttribute);
}
}