| ; RUN: opt < %s -analyze -branch-prob -enable-new-pm=0 | FileCheck %s |
| ; RUN: opt < %s -analyze -lazy-branch-prob -enable-new-pm=0 | FileCheck %s |
| ; RUN: opt < %s -passes='print<branch-prob>' -disable-output 2>&1 | FileCheck %s |
| |
| declare i32 @strcmp(i8*, i8*) |
| declare i32 @strncmp(i8*, i8*, i32) |
| declare i32 @strcasecmp(i8*, i8*) |
| declare i32 @strncasecmp(i8*, i8*, i32) |
| declare i32 @memcmp(i8*, i8*) |
| declare i32 @bcmp(i8*, i8*) |
| declare i32 @nonstrcmp(i8*, i8*) |
| |
| |
| ; Check that the result of strcmp is considered more likely to be nonzero than |
| ; zero, and equally likely to be (nonzero) positive or negative. |
| |
| define i32 @test_strcmp_eq(i8* %p, i8* %q) { |
| ; CHECK: Printing analysis {{.*}} for function 'test_strcmp_eq' |
| entry: |
| %val = call i32 @strcmp(i8* %p, i8* %q) |
| %cond = icmp eq i32 %val, 0 |
| br i1 %cond, label %then, label %else |
| ; CHECK: edge entry -> then probability is 0x30000000 / 0x80000000 = 37.50% |
| ; CHECK: edge entry -> else probability is 0x50000000 / 0x80000000 = 62.50% |
| |
| then: |
| br label %exit |
| ; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| else: |
| br label %exit |
| ; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| exit: |
| %result = phi i32 [ 0, %then ], [ 1, %else ] |
| ret i32 %result |
| } |
| |
| define i32 @test_strcmp_eq5(i8* %p, i8* %q) { |
| ; CHECK: Printing analysis {{.*}} for function 'test_strcmp_eq5' |
| entry: |
| %val = call i32 @strcmp(i8* %p, i8* %q) |
| %cond = icmp eq i32 %val, 5 |
| br i1 %cond, label %then, label %else |
| ; CHECK: edge entry -> then probability is 0x30000000 / 0x80000000 = 37.50% |
| ; CHECK: edge entry -> else probability is 0x50000000 / 0x80000000 = 62.50% |
| |
| then: |
| br label %exit |
| ; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| else: |
| br label %exit |
| ; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| exit: |
| %result = phi i32 [ 0, %then ], [ 1, %else ] |
| ret i32 %result |
| } |
| |
| define i32 @test_strcmp_ne(i8* %p, i8* %q) { |
| ; CHECK: Printing analysis {{.*}} for function 'test_strcmp_ne' |
| entry: |
| %val = call i32 @strcmp(i8* %p, i8* %q) |
| %cond = icmp ne i32 %val, 0 |
| br i1 %cond, label %then, label %else |
| ; CHECK: edge entry -> then probability is 0x50000000 / 0x80000000 = 62.50% |
| ; CHECK: edge entry -> else probability is 0x30000000 / 0x80000000 = 37.50% |
| |
| then: |
| br label %exit |
| ; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| else: |
| br label %exit |
| ; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| exit: |
| %result = phi i32 [ 0, %then ], [ 1, %else ] |
| ret i32 %result |
| } |
| |
| define i32 @test_strcmp_sgt(i8* %p, i8* %q) { |
| ; CHECK: Printing analysis {{.*}} for function 'test_strcmp_sgt' |
| entry: |
| %val = call i32 @strcmp(i8* %p, i8* %q) |
| %cond = icmp sgt i32 %val, 0 |
| br i1 %cond, label %then, label %else |
| ; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00% |
| ; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00% |
| |
| then: |
| br label %exit |
| ; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| else: |
| br label %exit |
| ; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| exit: |
| %result = phi i32 [ 0, %then ], [ 1, %else ] |
| ret i32 %result |
| } |
| |
| define i32 @test_strcmp_slt(i8* %p, i8* %q) { |
| ; CHECK: Printing analysis {{.*}} for function 'test_strcmp_slt' |
| entry: |
| %val = call i32 @strcmp(i8* %p, i8* %q) |
| %cond = icmp slt i32 %val, 0 |
| br i1 %cond, label %then, label %else |
| ; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00% |
| ; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00% |
| |
| then: |
| br label %exit |
| ; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| else: |
| br label %exit |
| ; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| exit: |
| %result = phi i32 [ 0, %then ], [ 1, %else ] |
| ret i32 %result |
| } |
| |
| |
| ; Similarly check other library functions that have the same behaviour |
| |
| define i32 @test_strncmp_sgt(i8* %p, i8* %q) { |
| ; CHECK: Printing analysis {{.*}} for function 'test_strncmp_sgt' |
| entry: |
| %val = call i32 @strncmp(i8* %p, i8* %q, i32 4) |
| %cond = icmp sgt i32 %val, 0 |
| br i1 %cond, label %then, label %else |
| ; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00% |
| ; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00% |
| |
| then: |
| br label %exit |
| ; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| else: |
| br label %exit |
| ; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| exit: |
| %result = phi i32 [ 0, %then ], [ 1, %else ] |
| ret i32 %result |
| } |
| |
| define i32 @test_strcasecmp_sgt(i8* %p, i8* %q) { |
| ; CHECK: Printing analysis {{.*}} for function 'test_strcasecmp_sgt' |
| entry: |
| %val = call i32 @strcasecmp(i8* %p, i8* %q) |
| %cond = icmp sgt i32 %val, 0 |
| br i1 %cond, label %then, label %else |
| ; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00% |
| ; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00% |
| |
| then: |
| br label %exit |
| ; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| else: |
| br label %exit |
| ; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| exit: |
| %result = phi i32 [ 0, %then ], [ 1, %else ] |
| ret i32 %result |
| } |
| |
| define i32 @test_strncasecmp_sgt(i8* %p, i8* %q) { |
| ; CHECK: Printing analysis {{.*}} for function 'test_strncasecmp_sgt' |
| entry: |
| %val = call i32 @strncasecmp(i8* %p, i8* %q, i32 4) |
| %cond = icmp sgt i32 %val, 0 |
| br i1 %cond, label %then, label %else |
| ; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00% |
| ; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00% |
| |
| then: |
| br label %exit |
| ; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| else: |
| br label %exit |
| ; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| exit: |
| %result = phi i32 [ 0, %then ], [ 1, %else ] |
| ret i32 %result |
| } |
| |
| define i32 @test_memcmp_sgt(i8* %p, i8* %q) { |
| ; CHECK: Printing analysis {{.*}} for function 'test_memcmp_sgt' |
| entry: |
| %val = call i32 @memcmp(i8* %p, i8* %q) |
| %cond = icmp sgt i32 %val, 0 |
| br i1 %cond, label %then, label %else |
| ; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00% |
| ; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00% |
| |
| then: |
| br label %exit |
| ; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| else: |
| br label %exit |
| ; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| exit: |
| %result = phi i32 [ 0, %then ], [ 1, %else ] |
| ret i32 %result |
| } |
| |
| |
| ; Check that for the result of a call to a non-library function the default |
| ; heuristic is applied, i.e. positive more likely than negative, nonzero more |
| ; likely than zero. |
| |
| define i32 @test_nonstrcmp_eq(i8* %p, i8* %q) { |
| ; CHECK: Printing analysis {{.*}} for function 'test_nonstrcmp_eq' |
| entry: |
| %val = call i32 @nonstrcmp(i8* %p, i8* %q) |
| %cond = icmp eq i32 %val, 0 |
| br i1 %cond, label %then, label %else |
| ; CHECK: edge entry -> then probability is 0x30000000 / 0x80000000 = 37.50% |
| ; CHECK: edge entry -> else probability is 0x50000000 / 0x80000000 = 62.50% |
| |
| then: |
| br label %exit |
| ; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| else: |
| br label %exit |
| ; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| exit: |
| %result = phi i32 [ 0, %then ], [ 1, %else ] |
| ret i32 %result |
| } |
| |
| define i32 @test_nonstrcmp_ne(i8* %p, i8* %q) { |
| ; CHECK: Printing analysis {{.*}} for function 'test_nonstrcmp_ne' |
| entry: |
| %val = call i32 @nonstrcmp(i8* %p, i8* %q) |
| %cond = icmp ne i32 %val, 0 |
| br i1 %cond, label %then, label %else |
| ; CHECK: edge entry -> then probability is 0x50000000 / 0x80000000 = 62.50% |
| ; CHECK: edge entry -> else probability is 0x30000000 / 0x80000000 = 37.50% |
| |
| then: |
| br label %exit |
| ; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| else: |
| br label %exit |
| ; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| exit: |
| %result = phi i32 [ 0, %then ], [ 1, %else ] |
| ret i32 %result |
| } |
| |
| define i32 @test_nonstrcmp_sgt(i8* %p, i8* %q) { |
| ; CHECK: Printing analysis {{.*}} for function 'test_nonstrcmp_sgt' |
| entry: |
| %val = call i32 @nonstrcmp(i8* %p, i8* %q) |
| %cond = icmp sgt i32 %val, 0 |
| br i1 %cond, label %then, label %else |
| ; CHECK: edge entry -> then probability is 0x50000000 / 0x80000000 = 62.50% |
| ; CHECK: edge entry -> else probability is 0x30000000 / 0x80000000 = 37.50% |
| |
| then: |
| br label %exit |
| ; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| else: |
| br label %exit |
| ; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| exit: |
| %result = phi i32 [ 0, %then ], [ 1, %else ] |
| ret i32 %result |
| } |
| |
| |
| define i32 @test_bcmp_eq(i8* %p, i8* %q) { |
| ; CHECK: Printing analysis {{.*}} for function 'test_bcmp_eq' |
| entry: |
| %val = call i32 @bcmp(i8* %p, i8* %q) |
| %cond = icmp eq i32 %val, 0 |
| br i1 %cond, label %then, label %else |
| ; CHECK: edge entry -> then probability is 0x30000000 / 0x80000000 = 37.50% |
| ; CHECK: edge entry -> else probability is 0x50000000 / 0x80000000 = 62.50% |
| |
| then: |
| br label %exit |
| ; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| else: |
| br label %exit |
| ; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| exit: |
| %result = phi i32 [ 0, %then ], [ 1, %else ] |
| ret i32 %result |
| } |
| |
| define i32 @test_bcmp_eq5(i8* %p, i8* %q) { |
| ; CHECK: Printing analysis {{.*}} for function 'test_bcmp_eq5' |
| entry: |
| %val = call i32 @bcmp(i8* %p, i8* %q) |
| %cond = icmp eq i32 %val, 5 |
| br i1 %cond, label %then, label %else |
| ; CHECK: edge entry -> then probability is 0x30000000 / 0x80000000 = 37.50% |
| ; CHECK: edge entry -> else probability is 0x50000000 / 0x80000000 = 62.50% |
| |
| then: |
| br label %exit |
| ; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| else: |
| br label %exit |
| ; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| exit: |
| %result = phi i32 [ 0, %then ], [ 1, %else ] |
| ret i32 %result |
| } |
| |
| |
| |
| define i32 @test_bcmp_ne(i8* %p, i8* %q) { |
| ; CHECK: Printing analysis {{.*}} for function 'test_bcmp_ne' |
| entry: |
| %val = call i32 @bcmp(i8* %p, i8* %q) |
| %cond = icmp ne i32 %val, 0 |
| br i1 %cond, label %then, label %else |
| ; CHECK: edge entry -> then probability is 0x50000000 / 0x80000000 = 62.50% |
| ; CHECK: edge entry -> else probability is 0x30000000 / 0x80000000 = 37.50% |
| |
| then: |
| br label %exit |
| ; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| else: |
| br label %exit |
| ; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge] |
| |
| exit: |
| %result = phi i32 [ 0, %then ], [ 1, %else ] |
| ret i32 %result |
| } |