Mesa (master): ac: add ac_build_frexp_mant() helper and 16-bit/32-bit support

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Module: Mesa
Branch: master
Commit: 1bf9311c59d8a941680a69159e894a0883b8db7b
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=1bf9311c59d8a941680a69159e894a0883b8db7b

Author: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Date:   Thu Mar 21 15:47:04 2019 +0100

ac: add ac_build_frexp_mant() helper and 16-bit/32-bit support

Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>

---

 src/amd/common/ac_llvm_build.c  | 25 +++++++++++++++++++++++++
 src/amd/common/ac_llvm_build.h  |  4 ++++
 src/amd/common/ac_nir_to_llvm.c |  4 ++--
 3 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/src/amd/common/ac_llvm_build.c b/src/amd/common/ac_llvm_build.c
index 04d4b377fd1..4fd1d14b78f 100644
--- a/src/amd/common/ac_llvm_build.c
+++ b/src/amd/common/ac_llvm_build.c
@@ -3926,3 +3926,28 @@ ac_build_shuffle(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef ind
 		  AC_FUNC_ATTR_READNONE |
 		  AC_FUNC_ATTR_CONVERGENT);
 }
+
+LLVMValueRef
+ac_build_frexp_mant(struct ac_llvm_context *ctx, LLVMValueRef src0,
+		    unsigned bitsize)
+{
+	LLVMTypeRef type;
+	char *intr;
+
+	if (bitsize == 16) {
+		intr = "llvm.amdgcn.frexp.mant.f16";
+		type = ctx->f16;
+	} else if (bitsize == 32) {
+		intr = "llvm.amdgcn.frexp.mant.f32";
+		type = ctx->f32;
+	} else {
+		intr = "llvm.amdgcn.frexp.mant.f64";
+		type = ctx->f64;
+	}
+
+	LLVMValueRef params[] = {
+		src0,
+	};
+	return ac_build_intrinsic(ctx, intr, type, params, 1,
+				  AC_FUNC_ATTR_READNONE);
+}
diff --git a/src/amd/common/ac_llvm_build.h b/src/amd/common/ac_llvm_build.h
index 14c1c56522b..db20b39d443 100644
--- a/src/amd/common/ac_llvm_build.h
+++ b/src/amd/common/ac_llvm_build.h
@@ -677,6 +677,10 @@ ac_build_quad_swizzle(struct ac_llvm_context *ctx, LLVMValueRef src,
 LLVMValueRef
 ac_build_shuffle(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef index);
 
+LLVMValueRef
+ac_build_frexp_mant(struct ac_llvm_context *ctx, LLVMValueRef src0,
+		    unsigned bitsize);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
index f16be5c0f2a..936d1eec34f 100644
--- a/src/amd/common/ac_nir_to_llvm.c
+++ b/src/amd/common/ac_nir_to_llvm.c
@@ -809,8 +809,8 @@ static void visit_alu(struct ac_nir_context *ctx, const nir_alu_instr *instr)
 		break;
 	case nir_op_frexp_sig:
 		src[0] = ac_to_float(&ctx->ac, src[0]);
-		result = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.frexp.mant.f64",
-					    ctx->ac.f64, src, 1, AC_FUNC_ATTR_READNONE);
+		result = ac_build_frexp_mant(&ctx->ac, src[0],
+					     instr->dest.dest.ssa.bit_size);
 		break;
 	case nir_op_fpow:
 		result = emit_intrin_2f_param(&ctx->ac, "llvm.pow",