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Imported Upstream version 5.18.0.167
Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a
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; RUN: opt < %s -analyze -branch-prob | FileCheck %s
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; RUN: opt < %s -analyze -lazy-branch-prob | FileCheck %s
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; RUN: opt < %s -passes='print<branch-prob>' -disable-output 2>&1 | FileCheck %s
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declare i32 @strcmp(i8*, i8*)
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declare i32 @strncmp(i8*, i8*, i32)
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declare i32 @strcasecmp(i8*, i8*)
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declare i32 @strncasecmp(i8*, i8*, i32)
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declare i32 @memcmp(i8*, i8*)
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declare i32 @nonstrcmp(i8*, i8*)
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; Check that the result of strcmp is considered more likely to be nonzero than
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; zero, and equally likely to be (nonzero) positive or negative.
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define i32 @test_strcmp_eq(i8* %p, i8* %q) {
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; CHECK: Printing analysis {{.*}} for function 'test_strcmp_eq'
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entry:
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%val = call i32 @strcmp(i8* %p, i8* %q)
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%cond = icmp eq i32 %val, 0
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br i1 %cond, label %then, label %else
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; CHECK: edge entry -> then probability is 0x30000000 / 0x80000000 = 37.50%
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; CHECK: edge entry -> else probability is 0x50000000 / 0x80000000 = 62.50%
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then:
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br label %exit
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; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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else:
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br label %exit
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; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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exit:
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%result = phi i32 [ 0, %then ], [ 1, %else ]
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ret i32 %result
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}
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define i32 @test_strcmp_ne(i8* %p, i8* %q) {
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; CHECK: Printing analysis {{.*}} for function 'test_strcmp_ne'
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entry:
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%val = call i32 @strcmp(i8* %p, i8* %q)
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%cond = icmp ne i32 %val, 0
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br i1 %cond, label %then, label %else
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; CHECK: edge entry -> then probability is 0x50000000 / 0x80000000 = 62.50%
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; CHECK: edge entry -> else probability is 0x30000000 / 0x80000000 = 37.50%
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then:
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br label %exit
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; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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else:
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br label %exit
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; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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exit:
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%result = phi i32 [ 0, %then ], [ 1, %else ]
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ret i32 %result
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}
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define i32 @test_strcmp_sgt(i8* %p, i8* %q) {
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; CHECK: Printing analysis {{.*}} for function 'test_strcmp_sgt'
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entry:
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%val = call i32 @strcmp(i8* %p, i8* %q)
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%cond = icmp sgt i32 %val, 0
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br i1 %cond, label %then, label %else
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; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00%
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; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00%
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then:
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br label %exit
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; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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else:
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br label %exit
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; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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exit:
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%result = phi i32 [ 0, %then ], [ 1, %else ]
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ret i32 %result
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}
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define i32 @test_strcmp_slt(i8* %p, i8* %q) {
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; CHECK: Printing analysis {{.*}} for function 'test_strcmp_slt'
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entry:
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%val = call i32 @strcmp(i8* %p, i8* %q)
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%cond = icmp slt i32 %val, 0
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br i1 %cond, label %then, label %else
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; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00%
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; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00%
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then:
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br label %exit
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; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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else:
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br label %exit
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; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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exit:
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%result = phi i32 [ 0, %then ], [ 1, %else ]
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ret i32 %result
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}
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; Similarly check other library functions that have the same behaviour
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define i32 @test_strncmp_sgt(i8* %p, i8* %q) {
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; CHECK: Printing analysis {{.*}} for function 'test_strncmp_sgt'
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entry:
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%val = call i32 @strncmp(i8* %p, i8* %q, i32 4)
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%cond = icmp sgt i32 %val, 0
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br i1 %cond, label %then, label %else
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; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00%
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; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00%
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then:
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br label %exit
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; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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else:
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br label %exit
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; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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exit:
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%result = phi i32 [ 0, %then ], [ 1, %else ]
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ret i32 %result
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}
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define i32 @test_strcasecmp_sgt(i8* %p, i8* %q) {
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; CHECK: Printing analysis {{.*}} for function 'test_strcasecmp_sgt'
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entry:
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%val = call i32 @strcasecmp(i8* %p, i8* %q)
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%cond = icmp sgt i32 %val, 0
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br i1 %cond, label %then, label %else
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; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00%
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; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00%
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then:
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br label %exit
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; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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else:
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br label %exit
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; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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exit:
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%result = phi i32 [ 0, %then ], [ 1, %else ]
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ret i32 %result
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}
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define i32 @test_strncasecmp_sgt(i8* %p, i8* %q) {
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; CHECK: Printing analysis {{.*}} for function 'test_strncasecmp_sgt'
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entry:
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%val = call i32 @strncasecmp(i8* %p, i8* %q, i32 4)
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%cond = icmp sgt i32 %val, 0
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br i1 %cond, label %then, label %else
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; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00%
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; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00%
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then:
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br label %exit
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; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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else:
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br label %exit
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; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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exit:
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%result = phi i32 [ 0, %then ], [ 1, %else ]
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ret i32 %result
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}
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define i32 @test_memcmp_sgt(i8* %p, i8* %q) {
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; CHECK: Printing analysis {{.*}} for function 'test_memcmp_sgt'
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entry:
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%val = call i32 @memcmp(i8* %p, i8* %q)
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%cond = icmp sgt i32 %val, 0
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br i1 %cond, label %then, label %else
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; CHECK: edge entry -> then probability is 0x40000000 / 0x80000000 = 50.00%
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; CHECK: edge entry -> else probability is 0x40000000 / 0x80000000 = 50.00%
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then:
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br label %exit
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; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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else:
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br label %exit
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; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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exit:
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%result = phi i32 [ 0, %then ], [ 1, %else ]
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ret i32 %result
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}
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; Check that for the result of a call to a non-library function the default
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; heuristic is applied, i.e. positive more likely than negative, nonzero more
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; likely than zero.
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define i32 @test_nonstrcmp_eq(i8* %p, i8* %q) {
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; CHECK: Printing analysis {{.*}} for function 'test_nonstrcmp_eq'
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entry:
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%val = call i32 @nonstrcmp(i8* %p, i8* %q)
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%cond = icmp eq i32 %val, 0
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br i1 %cond, label %then, label %else
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; CHECK: edge entry -> then probability is 0x30000000 / 0x80000000 = 37.50%
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; CHECK: edge entry -> else probability is 0x50000000 / 0x80000000 = 62.50%
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then:
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br label %exit
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; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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else:
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br label %exit
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; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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exit:
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%result = phi i32 [ 0, %then ], [ 1, %else ]
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ret i32 %result
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}
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define i32 @test_nonstrcmp_ne(i8* %p, i8* %q) {
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; CHECK: Printing analysis {{.*}} for function 'test_nonstrcmp_ne'
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entry:
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%val = call i32 @nonstrcmp(i8* %p, i8* %q)
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%cond = icmp ne i32 %val, 0
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br i1 %cond, label %then, label %else
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; CHECK: edge entry -> then probability is 0x50000000 / 0x80000000 = 62.50%
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; CHECK: edge entry -> else probability is 0x30000000 / 0x80000000 = 37.50%
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then:
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br label %exit
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; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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else:
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br label %exit
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; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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exit:
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%result = phi i32 [ 0, %then ], [ 1, %else ]
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ret i32 %result
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}
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define i32 @test_nonstrcmp_sgt(i8* %p, i8* %q) {
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; CHECK: Printing analysis {{.*}} for function 'test_nonstrcmp_sgt'
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entry:
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%val = call i32 @nonstrcmp(i8* %p, i8* %q)
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%cond = icmp sgt i32 %val, 0
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br i1 %cond, label %then, label %else
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; CHECK: edge entry -> then probability is 0x50000000 / 0x80000000 = 62.50%
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; CHECK: edge entry -> else probability is 0x30000000 / 0x80000000 = 37.50%
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then:
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br label %exit
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; CHECK: edge then -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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else:
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br label %exit
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; CHECK: edge else -> exit probability is 0x80000000 / 0x80000000 = 100.00% [HOT edge]
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exit:
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%result = phi i32 [ 0, %then ], [ 1, %else ]
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ret i32 %result
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}
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