From 7f8d138f50f57144650dfba78ea0e6e168a23c54 Mon Sep 17 00:00:00 2001 From: Juergen Ributzka Date: Fri, 13 Jun 2014 00:45:11 +0000 Subject: [FastISel][X86] - Add branch weights Add branch weights to branch instructions, so that the following passes can optimize based on it (i.e. basic block ordering). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210863 91177308-0d34-0410-b5e6-96231b3b80d8 --- test/CodeGen/X86/fast-isel-branch_weights.ll | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 test/CodeGen/X86/fast-isel-branch_weights.ll (limited to 'test') diff --git a/test/CodeGen/X86/fast-isel-branch_weights.ll b/test/CodeGen/X86/fast-isel-branch_weights.ll new file mode 100644 index 0000000000..bc41395e1e --- /dev/null +++ b/test/CodeGen/X86/fast-isel-branch_weights.ll @@ -0,0 +1,19 @@ +; RUN: llc < %s -mtriple=x86_64-apple-darwin10 | FileCheck %s +; RUN: llc < %s -fast-isel -fast-isel-abort -mtriple=x86_64-apple-darwin10 | FileCheck %s + +; Test if the BBs are reordred according to their branch weights. +define i64 @branch_weights_test(i64 %a, i64 %b) { +; CHECK-LABEL: branch_weights_test +; CHECK-LABEL: success +; CHECK-LABEL: fail + %1 = icmp ult i64 %a, %b + br i1 %1, label %fail, label %success, !prof !0 + +fail: + ret i64 -1 + +success: + ret i64 0 +} + +!0 = metadata !{metadata !"branch_weights", i32 0, i32 2147483647} -- cgit v1.2.3