Mesa (master): ac: add ac_build_frex_exp() helper ans 16-bit/32-bit support

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Module: Mesa
Branch: master
Commit: 52c02d921f94aec3635fc4352c2deccbb9e718ea
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=52c02d921f94aec3635fc4352c2deccbb9e718ea

Author: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Date:   Fri Mar 22 11:59:32 2019 +0100

ac: add ac_build_frex_exp() helper ans 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  | 24 ++++++++++++++++++++++++
 src/amd/common/ac_llvm_build.h  |  4 ++++
 src/amd/common/ac_nir_to_llvm.c |  8 +++++---
 3 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/src/amd/common/ac_llvm_build.c b/src/amd/common/ac_llvm_build.c
index 4fd1d14b78f..5572b244720 100644
--- a/src/amd/common/ac_llvm_build.c
+++ b/src/amd/common/ac_llvm_build.c
@@ -3928,6 +3928,30 @@ ac_build_shuffle(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef ind
 }
 
 LLVMValueRef
+ac_build_frexp_exp(struct ac_llvm_context *ctx, LLVMValueRef src0,
+		   unsigned bitsize)
+{
+	LLVMTypeRef type;
+	char *intr;
+
+	if (bitsize == 16) {
+		intr = "llvm.amdgcn.frexp.exp.i16.f16";
+		type = ctx->i16;
+	} else if (bitsize == 32) {
+		intr = "llvm.amdgcn.frexp.exp.i32.f32";
+		type = ctx->i32;
+	} else {
+		intr = "llvm.amdgcn.frexp.exp.i32.f64";
+		type = ctx->i64;
+	}
+
+	LLVMValueRef params[] = {
+		src0,
+	};
+	return ac_build_intrinsic(ctx, intr, type, params, 1,
+				  AC_FUNC_ATTR_READNONE);
+}
+LLVMValueRef
 ac_build_frexp_mant(struct ac_llvm_context *ctx, LLVMValueRef src0,
 		    unsigned bitsize)
 {
diff --git a/src/amd/common/ac_llvm_build.h b/src/amd/common/ac_llvm_build.h
index db20b39d443..c3277fd2d13 100644
--- a/src/amd/common/ac_llvm_build.h
+++ b/src/amd/common/ac_llvm_build.h
@@ -678,6 +678,10 @@ LLVMValueRef
 ac_build_shuffle(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef index);
 
 LLVMValueRef
+ac_build_frexp_exp(struct ac_llvm_context *ctx, LLVMValueRef src0,
+		   unsigned bitsize);
+
+LLVMValueRef
 ac_build_frexp_mant(struct ac_llvm_context *ctx, LLVMValueRef src0,
 		    unsigned bitsize);
 
diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
index 936d1eec34f..2321fed69f3 100644
--- a/src/amd/common/ac_nir_to_llvm.c
+++ b/src/amd/common/ac_nir_to_llvm.c
@@ -803,9 +803,11 @@ static void visit_alu(struct ac_nir_context *ctx, const nir_alu_instr *instr)
 		break;
 	case nir_op_frexp_exp:
 		src[0] = ac_to_float(&ctx->ac, src[0]);
-		result = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.frexp.exp.i32.f64",
-					    ctx->ac.i32, src, 1, AC_FUNC_ATTR_READNONE);
-
+		result = ac_build_frexp_exp(&ctx->ac, src[0],
+					    ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[0])));
+		if (ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[0])) == 16)
+			result = LLVMBuildSExt(ctx->ac.builder, result,
+					       ctx->ac.i32, "");
 		break;
 	case nir_op_frexp_sig:
 		src[0] = ac_to_float(&ctx->ac, src[0]);