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Print block frequencies in decimal form.

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This is easier to read than the internal fixed-point representation.

If anybody knows the correct algorithm for converting fixed-point
numbers to base 10, feel free to fix it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184881 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2013-06-25 21:57:38 +00:00
parent 5e48a0e9ae
commit b1c0cc22dd
2 changed files with 26 additions and 17 deletions
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11
lib/Support/BlockFrequency.cpp
View File

@ -117,7 +117,16 @@ BlockFrequency::operator+(const BlockFrequency &Prob) const {
}
void BlockFrequency::print(raw_ostream &OS) const {
OS << Frequency;
// Convert fixed-point number to decimal.
OS << Frequency / getEntryFrequency() << ".";
uint64_t Rem = Frequency % getEntryFrequency();
uint64_t Eps = 1;
do {
Rem *= 10;
Eps *= 10;
OS << Rem / getEntryFrequency();
Rem = Rem % getEntryFrequency();
} while (Rem >= Eps/2);
}
namespace llvm {

32
test/Analysis/BlockFrequencyInfo/basic.ll
View File

@ -2,12 +2,12 @@
define i32 @test1(i32 %i, i32* %a) {
; CHECK: Printing analysis {{.*}} for function 'test1'
; CHECK: entry = 16384
; CHECK: entry = 1.0
entry:
br label %body
; Loop backedges are weighted and thus their bodies have a greater frequency.
; CHECK: body = 524288
; CHECK: body = 32.0
body:
%iv = phi i32 [ 0, %entry ], [ %next, %body ]
%base = phi i32 [ 0, %entry ], [ %sum, %body ]
@ -18,29 +18,29 @@ body:
%exitcond = icmp eq i32 %next, %i
br i1 %exitcond, label %exit, label %body
; CHECK: exit = 16384
; CHECK: exit = 1.0
exit:
ret i32 %sum
}
define i32 @test2(i32 %i, i32 %a, i32 %b) {
; CHECK: Printing analysis {{.*}} for function 'test2'
; CHECK: entry = 16384
; CHECK: entry = 1.0
entry:
%cond = icmp ult i32 %i, 42
br i1 %cond, label %then, label %else, !prof !0
; The 'then' branch is predicted more likely via branch weight metadata.
; CHECK: then = 15420
; CHECK: then = 0.94116
then:
br label %exit
; CHECK: else = 963
; CHECK: else = 0.05877
else:
br label %exit
; FIXME: It may be a bug that we don't sum back to 16384.
; CHECK: exit = 16383
; FIXME: It may be a bug that we don't sum back to 1.0.
; CHECK: exit = 0.99993
exit:
%result = phi i32 [ %a, %then ], [ %b, %else ]
ret i32 %result
@ -50,36 +50,36 @@ exit:
define i32 @test3(i32 %i, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) {
; CHECK: Printing analysis {{.*}} for function 'test3'
; CHECK: entry = 16384
; CHECK: entry = 1.0
entry:
switch i32 %i, label %case_a [ i32 1, label %case_b
i32 2, label %case_c
i32 3, label %case_d
i32 4, label %case_e ], !prof !1
; CHECK: case_a = 819
; CHECK: case_a = 0.04998
case_a:
br label %exit
; CHECK: case_b = 819
; CHECK: case_b = 0.04998
case_b:
br label %exit
; The 'case_c' branch is predicted more likely via branch weight metadata.
; CHECK: case_c = 13107
; CHECK: case_c = 0.79998
case_c:
br label %exit
; CHECK: case_d = 819
; CHECK: case_d = 0.04998
case_d:
br label %exit
; CHECK: case_e = 819
; CHECK: case_e = 0.04998
case_e:
br label %exit
; FIXME: It may be a bug that we don't sum back to 16384.
; CHECK: exit = 16383
; FIXME: It may be a bug that we don't sum back to 1.0.
; CHECK: exit = 0.99993
exit:
%result = phi i32 [ %a, %case_a ],
[ %b, %case_b ],