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Revert "Use uint64_t for branch weights instead of uint32_t"
This reverts commit e5766f2. Makes clang assert when building Chromium, see https://crbug.com/1142813 for a repro.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| // Test that big branch weights get scaled down to 32-bits, rather than just | ||
| // truncated. | ||
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| // RUN: llvm-profdata merge %S/Inputs/c-counter-overflows.proftext -o %t.profdata | ||
| // RUN: %clang_cc1 -triple x86_64-apple-macosx10.9 -main-file-name c-counter-overflows.c %s -o - -emit-llvm -fprofile-instrument-use-path=%t.profdata | FileCheck %s | ||
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| typedef unsigned long long uint64_t; | ||
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| int main(int argc, const char *argv[]) { | ||
| // Need counts higher than 32-bits. | ||
| // CHECK: br {{.*}} !prof ![[FOR:[0-9]+]] | ||
| // max = 0xffffffff0 | ||
| // scale = 0xffffffff0 / 0xffffffff + 1 = 17 | ||
| // loop-body: 0xffffffff0 / 17 + 1 = 0xf0f0f0f0 + 1 = 4042322161 => -252645135 | ||
| // loop-exit: 0x000000001 / 17 + 1 = 0x00000000 + 1 = 1 => 1 | ||
| for (uint64_t I = 0; I < 0xffffffff0; ++I) { | ||
| // max = 0xffffffff * 15 = 0xefffffff1 | ||
| // scale = 0xefffffff1 / 0xffffffff + 1 = 16 | ||
| // CHECK: br {{.*}} !prof ![[IF:[0-9]+]] | ||
| if (I & 0xf) { | ||
| // 0xefffffff1 / 16 + 1 = 0xefffffff + 1 = 4026531840 => -268435456 | ||
| } else { | ||
| // 0x0ffffffff / 16 + 1 = 0x0fffffff + 1 = 268435456 => 268435456 | ||
| } | ||
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||
| // max = 0xffffffff * 5 = 0x4fffffffb | ||
| // scale = 0x4fffffffb / 0xffffffff + 1 = 6 | ||
| // CHECK: ], !prof ![[SWITCH:[0-9]+]] | ||
| switch ((I & 0xf) / 5) { | ||
| case 0: | ||
| // 0x4fffffffb / 6 = 0xd5555554 + 1 = 3579139413 => -715827883 | ||
| break; | ||
| case 1: | ||
| // 0x4fffffffb / 6 = 0xd5555554 + 1 = 3579139413 => -715827883 | ||
| break; | ||
| case 2: | ||
| // 0x4fffffffb / 6 = 0xd5555554 + 1 = 3579139413 => -715827883 | ||
| break; | ||
| default: | ||
| // 0x0ffffffff / 6 = 0x2aaaaaaa + 1 = 715827883 => 715827883 | ||
| break; | ||
| } | ||
| } | ||
| return 0; | ||
| } | ||
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| // CHECK-DAG: ![[FOR]] = !{!"branch_weights", i32 -252645135, i32 1} | ||
| // CHECK-DAG: ![[IF]] = !{!"branch_weights", i32 -268435456, i32 268435456} | ||
| // CHECK-DAG: ![[SWITCH]] = !{!"branch_weights", i32 715827883, i32 -715827883, i32 -715827883, i32 -715827883} |
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