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ac: use an LLVM fence instead of s.waitcnt when possible 

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
This commit is contained in:
Marek Olšák 2019-06-29 01:03:29 -04:00
parent 14450c8c41
commit ea64d66fde
1 changed files with 9 additions and 9 deletions
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18
src/amd/common/ac_llvm_build.c
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@ -2887,6 +2887,15 @@ void ac_build_waitcnt(struct ac_llvm_context *ctx, unsigned wait_flags)
vmcnt = 0;
}
/* There is no intrinsic for vscnt(0), so use a fence. */
if ((wait_flags & AC_WAIT_LGKM &&
wait_flags & AC_WAIT_VLOAD &&
wait_flags & AC_WAIT_VSTORE) ||
vscnt == 0) {
LLVMBuildFence(ctx->builder, LLVMAtomicOrderingRelease, false, "");
return;
}
unsigned simm16 = (lgkmcnt << 8) |
(7 << 4) | /* expcnt */
(vmcnt & 0xf) |
@ -2897,15 +2906,6 @@ void ac_build_waitcnt(struct ac_llvm_context *ctx, unsigned wait_flags)
};
ac_build_intrinsic(ctx, "llvm.amdgcn.s.waitcnt",
ctx->voidt, args, 1, 0);
/* TODO: add llvm.amdgcn.s.waitcnt.vscnt into LLVM: */
if (0 && ctx->chip_class >= GFX10 && vscnt == 0) {
LLVMValueRef args[1] = {
LLVMConstInt(ctx->i32, vscnt, false),
};
ac_build_intrinsic(ctx, "llvm.amdgcn.s.waitcnt.vscnt",
ctx->voidt, args, 1, 0);
}
}
LLVMValueRef ac_build_fmed3(struct ac_llvm_context *ctx, LLVMValueRef src0,