mirror of
https://github.com/RPCS3/llvm-mirror.git
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7416a3a392
When calculating the cost of a call instruction we were applying a heuristic penalty as well as the cost of the instruction itself.
However, when calculating the benefit from inlining we weren't discounting the equivalent penalty for the call instruction that would be removed! This caused skew in the calculation and meant we wouldn't inline in the following, trivial case:
int g() {
h();
}
int f() {
g();
}
llvm-svn: 286814
205 lines
6.0 KiB
LLVM
205 lines
6.0 KiB
LLVM
; RUN: opt < %s -inline -S -inlinecold-threshold=75 | FileCheck %s
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; Test that functions with attribute Cold are not inlined while the
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; same function without attribute Cold will be inlined.
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; RUN: opt < %s -inline -S -inline-threshold=600 | FileCheck %s -check-prefix=OVERRIDE
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; The command line argument for inline-threshold should override
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; the default cold threshold, so a cold function with size bigger
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; than the default cold threshold (225) will be inlined.
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; RUN: opt < %s -inline -S | FileCheck %s -check-prefix=DEFAULT
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; The same cold function will not be inlined with the default behavior.
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@a = global i32 4
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; This function should be larger than the cold threshold (75), but smaller
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; than the regular threshold.
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; Function Attrs: nounwind readnone uwtable
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define i32 @simpleFunction(i32 %a) #0 {
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entry:
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call void @extern()
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%a1 = load volatile i32, i32* @a
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%x1 = add i32 %a1, %a1
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%a2 = load volatile i32, i32* @a
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%x2 = add i32 %x1, %a2
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%a3 = load volatile i32, i32* @a
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%x3 = add i32 %x2, %a3
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%a4 = load volatile i32, i32* @a
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%x4 = add i32 %x3, %a4
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%a5 = load volatile i32, i32* @a
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%x5 = add i32 %x4, %a5
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%a6 = load volatile i32, i32* @a
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%x6 = add i32 %x5, %a6
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%a7 = load volatile i32, i32* @a
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%x7 = add i32 %x6, %a6
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%a8 = load volatile i32, i32* @a
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%x8 = add i32 %x7, %a8
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%a9 = load volatile i32, i32* @a
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%x9 = add i32 %x8, %a9
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%a10 = load volatile i32, i32* @a
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%x10 = add i32 %x9, %a10
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%a11 = load volatile i32, i32* @a
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%x11 = add i32 %x10, %a11
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%a12 = load volatile i32, i32* @a
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%x12 = add i32 %x11, %a12
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%add = add i32 %x12, %a
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ret i32 %add
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}
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; Function Attrs: nounwind cold readnone uwtable
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define i32 @ColdFunction(i32 %a) #1 {
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; CHECK-LABEL: @ColdFunction
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; CHECK: ret
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; OVERRIDE-LABEL: @ColdFunction
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; OVERRIDE: ret
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; DEFAULT-LABEL: @ColdFunction
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; DEFAULT: ret
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entry:
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call void @extern()
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%a1 = load volatile i32, i32* @a
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%x1 = add i32 %a1, %a1
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%a2 = load volatile i32, i32* @a
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%x2 = add i32 %x1, %a2
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%a3 = load volatile i32, i32* @a
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%x3 = add i32 %x2, %a3
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%a4 = load volatile i32, i32* @a
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%x4 = add i32 %x3, %a4
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%a5 = load volatile i32, i32* @a
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%x5 = add i32 %x4, %a5
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%a6 = load volatile i32, i32* @a
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%x6 = add i32 %x5, %a6
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%a7 = load volatile i32, i32* @a
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%x7 = add i32 %x6, %a6
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%a8 = load volatile i32, i32* @a
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%x8 = add i32 %x7, %a8
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%a9 = load volatile i32, i32* @a
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%x9 = add i32 %x8, %a9
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%a10 = load volatile i32, i32* @a
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%x10 = add i32 %x9, %a10
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%a11 = load volatile i32, i32* @a
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%x11 = add i32 %x10, %a11
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%a12 = load volatile i32, i32* @a
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%x12 = add i32 %x11, %a12
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%add = add i32 %x12, %a
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ret i32 %add
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}
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; This function should be larger than the default cold threshold (225).
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define i32 @ColdFunction2(i32 %a) #1 {
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; CHECK-LABEL: @ColdFunction2
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; CHECK: ret
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; OVERRIDE-LABEL: @ColdFunction2
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; OVERRIDE: ret
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; DEFAULT-LABEL: @ColdFunction2
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; DEFAULT: ret
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entry:
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call void @extern()
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%a1 = load volatile i32, i32* @a
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%x1 = add i32 %a1, %a1
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%a2 = load volatile i32, i32* @a
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%x2 = add i32 %x1, %a2
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%a3 = load volatile i32, i32* @a
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%x3 = add i32 %x2, %a3
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%a4 = load volatile i32, i32* @a
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%x4 = add i32 %x3, %a4
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%a5 = load volatile i32, i32* @a
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%x5 = add i32 %x4, %a5
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%a6 = load volatile i32, i32* @a
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%x6 = add i32 %x5, %a6
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%a7 = load volatile i32, i32* @a
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%x7 = add i32 %x6, %a7
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%a8 = load volatile i32, i32* @a
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%x8 = add i32 %x7, %a8
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%a9 = load volatile i32, i32* @a
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%x9 = add i32 %x8, %a9
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%a10 = load volatile i32, i32* @a
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%x10 = add i32 %x9, %a10
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%a11 = load volatile i32, i32* @a
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%x11 = add i32 %x10, %a11
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%a12 = load volatile i32, i32* @a
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%x12 = add i32 %x11, %a12
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%a21 = load volatile i32, i32* @a
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%x21 = add i32 %x12, %a21
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%a22 = load volatile i32, i32* @a
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%x22 = add i32 %x21, %a22
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%a23 = load volatile i32, i32* @a
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%x23 = add i32 %x22, %a23
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%a24 = load volatile i32, i32* @a
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%x24 = add i32 %x23, %a24
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%a25 = load volatile i32, i32* @a
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%x25 = add i32 %x24, %a25
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%a26 = load volatile i32, i32* @a
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%x26 = add i32 %x25, %a26
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%a27 = load volatile i32, i32* @a
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%x27 = add i32 %x26, %a27
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%a28 = load volatile i32, i32* @a
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%x28 = add i32 %x27, %a28
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%a29 = load volatile i32, i32* @a
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%x29 = add i32 %x28, %a29
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%a30 = load volatile i32, i32* @a
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%x30 = add i32 %x29, %a30
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%a31 = load volatile i32, i32* @a
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%x31 = add i32 %x30, %a31
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%a32 = load volatile i32, i32* @a
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%x32 = add i32 %x31, %a32
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%a41 = load volatile i32, i32* @a
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%x41 = add i32 %x32, %a41
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%a42 = load volatile i32, i32* @a
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%x42 = add i32 %x41, %a42
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%a43 = load volatile i32, i32* @a
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%x43 = add i32 %x42, %a43
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%a44 = load volatile i32, i32* @a
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%x44 = add i32 %x43, %a44
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%a45 = load volatile i32, i32* @a
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%x45 = add i32 %x44, %a45
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%a46 = load volatile i32, i32* @a
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%x46 = add i32 %x45, %a46
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%a47 = load volatile i32, i32* @a
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%x47 = add i32 %x46, %a47
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%a48 = load volatile i32, i32* @a
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%x48 = add i32 %x47, %a48
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%a49 = load volatile i32, i32* @a
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%x49 = add i32 %x48, %a49
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%a50 = load volatile i32, i32* @a
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%x50 = add i32 %x49, %a50
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%a51 = load volatile i32, i32* @a
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%x51 = add i32 %x50, %a51
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%a52 = load volatile i32, i32* @a
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%x52 = add i32 %x51, %a52
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%add = add i32 %x52, %a
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ret i32 %add
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}
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; Function Attrs: nounwind readnone uwtable
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define i32 @bar(i32 %a) #0 {
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; CHECK-LABEL: @bar
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; CHECK: call i32 @ColdFunction(i32 5)
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; CHECK-NOT: call i32 @simpleFunction(i32 6)
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; CHECK: call i32 @ColdFunction2(i32 5)
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; CHECK: ret
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; OVERRIDE-LABEL: @bar
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; OVERRIDE-NOT: call i32 @ColdFunction(i32 5)
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; OVERRIDE-NOT: call i32 @simpleFunction(i32 6)
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; OVERRIDE-NOT: call i32 @ColdFunction2(i32 5)
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; OVERRIDE: ret
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; DEFAULT-LABEL: @bar
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; DEFAULT-NOT: call i32 @ColdFunction(i32 5)
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; DEFAULT-NOT: call i32 @simpleFunction(i32 6)
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; DEFAULT: call i32 @ColdFunction2(i32 5)
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; DEFAULT: ret
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entry:
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%0 = tail call i32 @ColdFunction(i32 5)
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%1 = tail call i32 @simpleFunction(i32 6)
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%2 = tail call i32 @ColdFunction2(i32 5)
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%3 = add i32 %0, %1
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%add = add i32 %2, %3
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ret i32 %add
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}
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declare void @extern()
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attributes #0 = { nounwind readnone uwtable }
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attributes #1 = { nounwind cold readnone uwtable }
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