e3cf80c5c1
BlockFrequencyInfo calculates block frequencies as Scaled64 numbers but as a last step converts them to unsigned 64bit integers (`BlockFrequency`). This improves the factors picked for this conversion so that: * Avoid big numbers close to UINT64_MAX to avoid users overflowing/saturating when adding multiply frequencies together or when multiplying with integers. This leaves the topmost 10 bits unused to allow for some room. * Spread the difference between hottest/coldest block as much as possible to increase precision. * If the hot/cold spread cannot be represented loose precision at the lower end, but keep the frequencies at the upper end for hot blocks differentiable.
312 lines
14 KiB
LLVM
312 lines
14 KiB
LLVM
; RUN: llvm-profdata merge --sample -profile-isfs -o %t0.afdo %S/Inputs/fsloader.afdo
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; RUN: llc -enable-fs-discriminator -improved-fs-discriminator=false -fs-profile-file=%t0.afdo -disable-ra-fsprofile-loader=false -disable-layout-fsprofile-loader=false -print-machine-bfi -print-bfi-func-name=foo -print-before=fs-profile-loader -stop-after=fs-profile-loader < %s 2>&1 | FileCheck %s --check-prefixes=BFI,BFIV0
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; RUN: llvm-profdata merge --sample -profile-isfs -o %t1.afdo %S/Inputs/fsloader_v1.afdo
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; RUN: llc -enable-fs-discriminator -improved-fs-discriminator=true -fs-profile-file=%t1.afdo -disable-ra-fsprofile-loader=false -disable-layout-fsprofile-loader=false -print-machine-bfi -print-bfi-func-name=foo -print-before=fs-profile-loader -stop-after=fs-profile-loader < %s 2>&1 | FileCheck %s --check-prefixes=BFI,BFIV1
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;
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;;
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;; C source code for the test (compiler at -O3):
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;; // A test case for loop unroll.
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;;
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;; __attribute__((noinline)) int bar(int i){
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;; volatile int j;
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;; j = i;
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;; return j;
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;; }
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;;
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;; unsigned sum;
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;; __attribute__((noinline)) void work(int i){
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;; if (sum % 7)
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;; sum += i;
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;; else
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;; sum -= i;
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;; }
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;;
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;; __attribute__((noinline)) void foo(){
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;; int i, j;
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;; for (j = 0; j < 48; j++)
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;; for (i = 0; i < 4; i++) {
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;; int ii = bar(i+j*48);
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;; if (ii % 2)
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;; work(ii*2);
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;; if (ii % 4)
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;; work(ii*3);
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;; }
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;; }
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;;
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;; int main() {
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;; int i;
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;; for (i = 0; i < 10000000; i++) {
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;; foo();
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;; }
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;; }
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;;
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;; Check BFI before and after
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; BFI: block-frequency-info: foo
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; BFI: - BB0[entry]: float = 1.0, int = {{.*}}, count = 4268
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; BFI: - BB1[for.cond1.preheader]: float = 59.967, int = {{.*}}, count = 255941
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; BFI: - BB2[if.then]: float = 2.5405, int = {{.*}}, count = 10843
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; BFI: - BB3[if.end]: float = 59.967, int = {{.*}}, count = 255941
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; BFI: - BB4[if.then7]: float = 2.5405, int = {{.*}}, count = 10843
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; BFI: - BB5[if.end9]: float = 59.967, int = {{.*}}, count = 255941
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; BFI: - BB6[if.then.1]: float = 2.5405, int = {{.*}}, count = 10843
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; BFI: - BB7[if.end.1]: float = 59.967, int = {{.*}}, count = 255941
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; BFI: - BB8[if.then7.1]: float = 2.5405, int = {{.*}}, count = 10843
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; BFI: - BB9[if.end9.1]: float = 59.967, int = {{.*}}, count = 255941
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; BFI: - BB10[if.then.2]: float = 2.5405, int = {{.*}}, count = 10843
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; BFI: - BB11[if.end.2]: float = 59.967, int = {{.*}}, count = 255941
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; BFI: - BB12[if.then7.2]: float = 2.5405, int = {{.*}}, count = 10843
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; BFI: - BB13[if.end9.2]: float = 59.967, int = {{.*}}, count = 255941
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; BFI: - BB14[if.then.3]: float = 2.5405, int = {{.*}}, count = 10843
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; BFI: - BB15[if.end.3]: float = 59.967, int = {{.*}}, count = 255941
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; BFI: - BB16[if.then7.3]: float = 2.5405, int = {{.*}}, count = 10843
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; BFI: - BB17[if.end9.3]: float = 59.967, int = {{.*}}, count = 255941
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; BFI: - BB18[for.end12]: float = 1.0, int = {{.*}}, count = 4268
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;
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; BFI: # *** IR Dump Before SampleFDO loader in MIR (fs-profile-loader) ***:
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; BFI: # End machine code for function foo.
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; BFI-EMPTY:
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; BFI: block-frequency-info: foo
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; BFI: - BB0[entry]: float = 1.0, int = {{.*}}, count = 4268
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; BFI: - BB1[for.cond1.preheader]: float = 66.446, int = {{.*}}, count = 283590
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; BFI: - BB2[if.then]: float = 2.7041, int = {{.*}}, count = 11541
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; BFI: - BB3[if.end]: float = 66.446, int = {{.*}}, count = 283590
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; BFI: - BB4[if.then7]: float = 2.7041, int = {{.*}}, count = 11541
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; BFI: - BB5[if.end9]: float = 66.446, int = {{.*}}, count = 283590
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; BFI: - BB6[if.then.1]: float = 65.351, int = {{.*}}, count = 278916
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; BFI: - BB7[if.end.1]: float = 66.446, int = {{.*}}, count = 283590
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; BFI: - BB8[if.then7.1]: float = 66.446, int = {{.*}}, count = 283590
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; BFI: - BB9[if.end9.1]: float = 66.446, int = {{.*}}, count = 283590
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; BFIV0: - BB10[if.then.2]: float = 2.7041, int = {{.*}}, count = 11541
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; BFIV1: - BB10[if.then.2]: float = 61.075, int = {{.*}}, count = 260670
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; BFI: - BB11[if.end.2]: float = 66.446, int = {{.*}}, count = 283590
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; BFI: - BB12[if.then7.2]: float = 65.405, int = {{.*}}, count = 279149
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; BFI: - BB13[if.end9.2]: float = 66.446, int = {{.*}}, count = 283590
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; BFIV0: - BB14[if.then.3]: float = 61.075, int = {{.*}}, count = 260670
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; BFIV1: - BB14[if.then.3]: float = 2.7041, int = {{.*}}, count = 11541
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; BFI: - BB15[if.end.3]: float = 66.446, int = {{.*}}, count = 283590
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; BFI: - BB16[if.then7.3]: float = 54.846, int = {{.*}}, count = 234082
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; BFI: - BB17[if.end9.3]: float = 66.446, int = {{.*}}, count = 283590
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; BFI: - BB18[for.end12]: float = 1.0, int = {{.*}}, count = 4268
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target triple = "x86_64-unknown-linux-gnu"
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@sum = dso_local local_unnamed_addr global i32 0, align 4
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declare i32 @bar(i32 %i) #0
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declare void @work(i32 %i) #2
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declare i32 @main() #3
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define dso_local void @foo() local_unnamed_addr #0 !dbg !61 !prof !62 {
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entry:
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br label %for.cond1.preheader, !dbg !63
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for.cond1.preheader:
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%j.024 = phi i32 [ 0, %entry ], [ %inc11, %if.end9.3 ]
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%mul = mul nuw nsw i32 %j.024, 48
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%call = tail call i32 @bar(i32 %mul), !dbg !65, !prof !66
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%0 = and i32 %call, 1, !dbg !67
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%tobool.not = icmp eq i32 %0, 0, !dbg !67
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br i1 %tobool.not, label %if.end, label %if.then, !dbg !68, !prof !69
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if.then:
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%mul4 = shl nsw i32 %call, 1, !dbg !70
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tail call void @work(i32 %mul4), !dbg !71, !prof !72
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br label %if.end, !dbg !71
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if.end:
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%1 = and i32 %call, 3, !dbg !73
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%tobool6.not = icmp eq i32 %1, 0, !dbg !73
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br i1 %tobool6.not, label %if.end9, label %if.then7, !dbg !74, !prof !69
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if.then7:
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%mul8 = mul nsw i32 %call, 3, !dbg !75
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tail call void @work(i32 %mul8), !dbg !76, !prof !72
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br label %if.end9, !dbg !76
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if.end9:
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%add.1 = or i32 %mul, 1, !dbg !77
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%call.1 = tail call i32 @bar(i32 %add.1), !dbg !65, !prof !66
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%2 = and i32 %call.1, 1, !dbg !67
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%tobool.not.1 = icmp eq i32 %2, 0, !dbg !67
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br i1 %tobool.not.1, label %if.end.1, label %if.then.1, !dbg !68, !prof !69
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if.then.1:
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%mul4.1 = shl nsw i32 %call.1, 1, !dbg !70
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tail call void @work(i32 %mul4.1), !dbg !71, !prof !72
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br label %if.end.1, !dbg !71
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if.end.1:
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%3 = and i32 %call.1, 3, !dbg !73
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%tobool6.not.1 = icmp eq i32 %3, 0, !dbg !73
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br i1 %tobool6.not.1, label %if.end9.1, label %if.then7.1, !dbg !74, !prof !69
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if.then7.1:
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%mul8.1 = mul nsw i32 %call.1, 3, !dbg !75
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tail call void @work(i32 %mul8.1), !dbg !76, !prof !72
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br label %if.end9.1, !dbg !76
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if.end9.1:
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%add.2 = or i32 %mul, 2, !dbg !77
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%call.2 = tail call i32 @bar(i32 %add.2), !dbg !65, !prof !66
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%4 = and i32 %call.2, 1, !dbg !67
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%tobool.not.2 = icmp eq i32 %4, 0, !dbg !67
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br i1 %tobool.not.2, label %if.end.2, label %if.then.2, !dbg !68, !prof !69
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if.then.2:
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%mul4.2 = shl nsw i32 %call.2, 1, !dbg !70
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tail call void @work(i32 %mul4.2), !dbg !71, !prof !72
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br label %if.end.2, !dbg !71
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if.end.2:
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%5 = and i32 %call.2, 3, !dbg !73
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%tobool6.not.2 = icmp eq i32 %5, 0, !dbg !73
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br i1 %tobool6.not.2, label %if.end9.2, label %if.then7.2, !dbg !74, !prof !69
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if.then7.2:
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%mul8.2 = mul nsw i32 %call.2, 3, !dbg !75
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tail call void @work(i32 %mul8.2), !dbg !76, !prof !72
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br label %if.end9.2, !dbg !76
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if.end9.2:
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%add.3 = or i32 %mul, 3, !dbg !77
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%call.3 = tail call i32 @bar(i32 %add.3), !dbg !65, !prof !66
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%6 = and i32 %call.3, 1, !dbg !67
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%tobool.not.3 = icmp eq i32 %6, 0, !dbg !67
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br i1 %tobool.not.3, label %if.end.3, label %if.then.3, !dbg !68, !prof !69
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if.then.3:
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%mul4.3 = shl nsw i32 %call.3, 1, !dbg !70
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tail call void @work(i32 %mul4.3), !dbg !71, !prof !72
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br label %if.end.3, !dbg !71
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if.end.3:
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%7 = and i32 %call.3, 3, !dbg !73
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%tobool6.not.3 = icmp eq i32 %7, 0, !dbg !73
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br i1 %tobool6.not.3, label %if.end9.3, label %if.then7.3, !dbg !74, !prof !69
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if.then7.3:
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%mul8.3 = mul nsw i32 %call.3, 3, !dbg !75
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tail call void @work(i32 %mul8.3), !dbg !76, !prof !72
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br label %if.end9.3, !dbg !76
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if.end9.3:
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%inc11 = add nuw nsw i32 %j.024, 1, !dbg !78
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%exitcond.not = icmp eq i32 %inc11, 48, !dbg !80
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br i1 %exitcond.not, label %for.end12, label %for.cond1.preheader, !dbg !63, !prof !81, !llvm.loop !82
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for.end12:
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ret void, !dbg !86
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}
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attributes #0 = { nofree noinline nounwind uwtable "frame-pointer"="none" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" "use-sample-profile" }
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attributes #1 = { argmemonly mustprogress nofree nosync nounwind willreturn }
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attributes #2 = { mustprogress nofree noinline norecurse nosync nounwind uwtable willreturn "frame-pointer"="none" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" "use-sample-profile" }
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attributes #3 = { nofree nounwind uwtable "frame-pointer"="none" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" "use-sample-profile" }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!2, !3, !4, !5, !6, !35}
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!llvm.ident = !{!40}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 14.0.0 (https://github.com/llvm/llvm-project.git 755f5e23159796d727c3d95d60894a52eb675b1b)", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, splitDebugInlining: false, debugInfoForProfiling: true, nameTableKind: None)
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!1 = !DIFile(filename: "/tmp/aaa.c", directory: "/mnt/ssd/xur/llvm_dev/gitwork/llvm-project/rel")
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!2 = !{i32 7, !"Dwarf Version", i32 4}
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!3 = !{i32 2, !"Debug Info Version", i32 3}
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!4 = !{i32 1, !"wchar_size", i32 4}
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!5 = !{i32 7, !"uwtable", i32 1}
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!6 = !{i32 1, !"ProfileSummary", !7}
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!7 = !{!8, !9, !10, !11, !12, !13, !14, !15, !16, !17}
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!8 = !{!"ProfileFormat", !"SampleProfile"}
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!9 = !{!"TotalCount", i64 9484871}
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!10 = !{!"MaxCount", i64 1246499}
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!11 = !{!"MaxInternalCount", i64 0}
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!12 = !{!"MaxFunctionCount", i64 1346190}
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!13 = !{!"NumCounts", i64 31}
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!14 = !{!"NumFunctions", i64 4}
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!15 = !{!"IsPartialProfile", i64 0}
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!16 = !{!"PartialProfileRatio", double 0.000000e+00}
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!17 = !{!"DetailedSummary", !18}
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!18 = !{!19, !20, !21, !22, !23, !24, !25, !26, !27, !28, !29, !30, !31, !32, !33, !34}
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!19 = !{i32 10000, i64 1246499, i32 2}
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!20 = !{i32 100000, i64 1246499, i32 2}
|
|
!21 = !{i32 200000, i64 1246499, i32 2}
|
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!22 = !{i32 300000, i64 1056020, i32 4}
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!23 = !{i32 400000, i64 1056020, i32 4}
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|
!24 = !{i32 500000, i64 283590, i32 6}
|
|
!25 = !{i32 600000, i64 279149, i32 9}
|
|
!26 = !{i32 700000, i64 278916, i32 12}
|
|
!27 = !{i32 800000, i64 269485, i32 15}
|
|
!28 = !{i32 900000, i64 260670, i32 19}
|
|
!29 = !{i32 950000, i64 234082, i32 22}
|
|
!30 = !{i32 990000, i64 234082, i32 22}
|
|
!31 = !{i32 999000, i64 4156, i32 27}
|
|
!32 = !{i32 999900, i64 4045, i32 29}
|
|
!33 = !{i32 999990, i64 4045, i32 29}
|
|
!34 = !{i32 999999, i64 4045, i32 29}
|
|
!35 = !{i32 5, !"CG Profile", !36}
|
|
!36 = !{!37, !38, !39}
|
|
!37 = !{ptr @foo, ptr @bar, i64 1022188}
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|
!38 = !{ptr @foo, ptr @work, i64 85360}
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|
!39 = !{ptr @main, ptr @foo, i64 2080}
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|
!40 = !{!"clang version 14.0.0 (https://github.com/llvm/llvm-project.git 755f5e23159796d727c3d95d60894a52eb675b1b)"}
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|
!41 = distinct !DISubprogram(name: "bar", scope: !42, file: !42, line: 3, type: !43, scopeLine: 3, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !44)
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|
!42 = !DIFile(filename: "/tmp/aaa.c", directory: "")
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|
!43 = !DISubroutineType(types: !44)
|
|
!44 = !{}
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|
!45 = !{!"function_entry_count", i64 1076806}
|
|
!46 = !DILocation(line: 4, column: 3, scope: !41)
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|
!47 = !DILocation(line: 5, column: 5, scope: !41)
|
|
!48 = !{!49, !49, i64 0}
|
|
!49 = !{!"int", !50, i64 0}
|
|
!50 = !{!"omnipotent char", !51, i64 0}
|
|
!51 = !{!"Simple C/C++ TBAA"}
|
|
!52 = !DILocation(line: 6, column: 10, scope: !41)
|
|
!53 = !DILocation(line: 7, column: 1, scope: !41)
|
|
!54 = !DILocation(line: 6, column: 3, scope: !41)
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|
!55 = distinct !DISubprogram(name: "work", scope: !42, file: !42, line: 10, type: !43, scopeLine: 10, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !44)
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|
!56 = !{!"function_entry_count", i64 1346191}
|
|
!57 = !DILocation(line: 11, column: 7, scope: !55)
|
|
!58 = !DILocation(line: 11, column: 11, scope: !55)
|
|
!59 = !DILocation(line: 0, scope: !55)
|
|
!60 = !DILocation(line: 15, column: 1, scope: !55)
|
|
!61 = distinct !DISubprogram(name: "foo", scope: !42, file: !42, line: 17, type: !43, scopeLine: 17, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !44)
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|
!62 = !{!"function_entry_count", i64 4268}
|
|
!63 = !DILocation(line: 19, column: 3, scope: !64)
|
|
!64 = !DILexicalBlockFile(scope: !61, file: !42, discriminator: 1)
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|
!65 = !DILocation(line: 21, column: 16, scope: !61)
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|
!66 = !{!"branch_weights", i32 272442}
|
|
!67 = !DILocation(line: 22, column: 14, scope: !61)
|
|
!68 = !DILocation(line: 22, column: 11, scope: !61)
|
|
!69 = !{!"branch_weights", i32 260902, i32 11542}
|
|
!70 = !DILocation(line: 23, column: 16, scope: !61)
|
|
!71 = !DILocation(line: 23, column: 9, scope: !61)
|
|
!72 = !{!"branch_weights", i32 11541}
|
|
!73 = !DILocation(line: 24, column: 14, scope: !61)
|
|
!74 = !DILocation(line: 24, column: 11, scope: !61)
|
|
!75 = !DILocation(line: 25, column: 16, scope: !61)
|
|
!76 = !DILocation(line: 25, column: 9, scope: !61)
|
|
!77 = !DILocation(line: 21, column: 21, scope: !61)
|
|
!78 = !DILocation(line: 19, column: 24, scope: !79)
|
|
!79 = !DILexicalBlockFile(scope: !61, file: !42, discriminator: 2)
|
|
!80 = !DILocation(line: 19, column: 17, scope: !64)
|
|
!81 = !{!"branch_weights", i32 4269, i32 251732}
|
|
!82 = distinct !{!82, !83, !84, !85}
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|
!83 = !DILocation(line: 19, column: 3, scope: !61)
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|
!84 = !DILocation(line: 26, column: 3, scope: !61)
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|
!85 = !{!"llvm.loop.mustprogress"}
|
|
!86 = !DILocation(line: 27, column: 1, scope: !61)
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|
!87 = distinct !DISubprogram(name: "main", scope: !42, file: !42, line: 29, type: !43, scopeLine: 29, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !44)
|
|
!88 = !{!"function_entry_count", i64 1}
|
|
!89 = !DILocation(line: 31, column: 3, scope: !90)
|
|
!90 = !DILexicalBlockFile(scope: !87, file: !42, discriminator: 1)
|
|
!91 = !DILocation(line: 32, column: 5, scope: !87)
|
|
!92 = !{!"branch_weights", i32 4156}
|
|
!93 = !DILocation(line: 31, column: 30, scope: !94)
|
|
!94 = !DILexicalBlockFile(scope: !87, file: !42, discriminator: 2)
|
|
!95 = !DILocation(line: 31, column: 17, scope: !90)
|
|
!96 = !{!"branch_weights", i32 2, i32 4157}
|
|
!97 = distinct !{!97, !98, !99, !85}
|
|
!98 = !DILocation(line: 31, column: 3, scope: !87)
|
|
!99 = !DILocation(line: 33, column: 3, scope: !87)
|
|
!100 = !DILocation(line: 34, column: 1, scope: !87)
|