diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/amd/common/ac_llvm_build.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/src/amd/common/ac_llvm_build.c b/src/amd/common/ac_llvm_build.c index c741a1ab62d..629cd2a7527 100644 --- a/src/amd/common/ac_llvm_build.c +++ b/src/amd/common/ac_llvm_build.c @@ -561,7 +561,14 @@ ac_build_fdiv(struct ac_llvm_context *ctx, LLVMValueRef num, LLVMValueRef den) { - LLVMValueRef ret = LLVMBuildFDiv(ctx->builder, num, den, ""); + /* If we do (num / den), LLVM >= 7.0 does: + * return num * v_rcp_f32(den * (fabs(den) > 0x1.0p+96f ? 0x1.0p-32f : 1.0f)); + * + * If we do (num * (1 / den)), LLVM does: + * return num * v_rcp_f32(den); + */ + LLVMValueRef rcp = LLVMBuildFDiv(ctx->builder, ctx->f32_1, den, ""); + LLVMValueRef ret = LLVMBuildFMul(ctx->builder, num, rcp, ""); /* Use v_rcp_f32 instead of precise division. */ if (!LLVMIsConstant(ret)) |