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7f8d138f50
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
20 lines
564 B
LLVM
20 lines
564 B
LLVM
; RUN: llc < %s -mtriple=x86_64-apple-darwin10 | FileCheck %s
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; RUN: llc < %s -fast-isel -fast-isel-abort -mtriple=x86_64-apple-darwin10 | FileCheck %s
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; Test if the BBs are reordred according to their branch weights.
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define i64 @branch_weights_test(i64 %a, i64 %b) {
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; CHECK-LABEL: branch_weights_test
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; CHECK-LABEL: success
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; CHECK-LABEL: fail
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%1 = icmp ult i64 %a, %b
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br i1 %1, label %fail, label %success, !prof !0
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fail:
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ret i64 -1
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success:
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ret i64 0
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}
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!0 = metadata !{metadata !"branch_weights", i32 0, i32 2147483647}
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