mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-18 10:31:57 +00:00
124 lines
2.7 KiB
LLVM
124 lines
2.7 KiB
LLVM
|
; RUN: opt -S -jump-threading < %s | FileCheck %s
|
||
|
|
|
||
|
|
declare void @foo()
|
||
|
|
declare void @bar()
|
||
|
|
declare void @baz()
|
||
|
|
declare void @quux()
|
||
|
|
|
||
|
|
|
||
|
|
; Jump threading of branch with select as condition.
|
||
|
|
; Mostly theoretical since instruction combining simplifies all selects of
|
||
|
|
; booleans where at least one operand is true/false/undef.
|
||
|
|
|
||
|
|
; CHECK: @test_br
|
||
|
|
; CHECK-NEXT: entry:
|
||
|
|
; CHECK-NEXT: br i1 %cond, label %L1,
|
||
|
|
define void @test_br(i1 %cond, i1 %value) nounwind {
|
||
|
|
entry:
|
||
|
|
br i1 %cond, label %L0, label %L3
|
||
|
|
L0:
|
||
|
|
%expr = select i1 %cond, i1 true, i1 %value
|
||
|
|
br i1 %expr, label %L1, label %L2
|
||
|
|
|
||
|
|
L1:
|
||
|
|
call void @foo()
|
||
|
|
ret void
|
||
|
|
L2:
|
||
|
|
call void @bar()
|
||
|
|
ret void
|
||
|
|
L3:
|
||
|
|
call void @baz()
|
||
|
|
br label %L0
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
; Jump threading of switch with select as condition.
|
||
|
|
|
||
|
|
; CHECK: @test_switch
|
||
|
|
; CHECK-NEXT: entry:
|
||
|
|
; CHECK-NEXT: br i1 %cond, label %L1,
|
||
|
|
define void @test_switch(i1 %cond, i8 %value) nounwind {
|
||
|
|
entry:
|
||
|
|
br i1 %cond, label %L0, label %L4
|
||
|
|
L0:
|
||
|
|
%expr = select i1 %cond, i8 1, i8 %value
|
||
|
|
switch i8 %expr, label %L3 [i8 1, label %L1 i8 2, label %L2]
|
||
|
|
|
||
|
|
L1:
|
||
|
|
call void @foo()
|
||
|
|
ret void
|
||
|
|
L2:
|
||
|
|
call void @bar()
|
||
|
|
ret void
|
||
|
|
L3:
|
||
|
|
call void @baz()
|
||
|
|
ret void
|
||
|
|
L4:
|
||
|
|
call void @quux()
|
||
|
|
br label %L0
|
||
|
|
}
|
||
|
|
|
||
|
|
; Make sure the blocks in the indirectbr test aren't trivially removable as
|
||
|
|
; successors by taking their addresses.
|
||
|
|
@anchor = constant [3 x i8*] [
|
||
|
|
i8* blockaddress(@test_indirectbr, %L1),
|
||
|
|
i8* blockaddress(@test_indirectbr, %L2),
|
||
|
|
i8* blockaddress(@test_indirectbr, %L3)
|
||
|
|
]
|
||
|
|
|
||
|
|
|
||
|
|
; Jump threading of indirectbr with select as address.
|
||
|
|
|
||
|
|
; CHECK: @test_indirectbr
|
||
|
|
; CHECK-NEXT: entry:
|
||
|
|
; CHECK-NEXT: br i1 %cond, label %L1, label %L3
|
||
|
|
define void @test_indirectbr(i1 %cond, i8* %address) nounwind {
|
||
|
|
entry:
|
||
|
|
br i1 %cond, label %L0, label %L3
|
||
|
|
L0:
|
||
|
|
%indirect.goto.dest = select i1 %cond, i8* blockaddress(@test_indirectbr, %L1), i8* %address
|
||
|
|
indirectbr i8* %indirect.goto.dest, [label %L1, label %L2, label %L3]
|
||
|
|
|
||
|
|
L1:
|
||
|
|
call void @foo()
|
||
|
|
ret void
|
||
|
|
L2:
|
||
|
|
call void @bar()
|
||
|
|
ret void
|
||
|
|
L3:
|
||
|
|
call void @baz()
|
||
|
|
ret void
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
; A more complicated case: the condition is a select based on a comparison.
|
||
|
|
|
||
|
|
; CHECK: @test_switch_cmp
|
||
|
|
; CHECK-NEXT: entry:
|
||
|
|
; CHECK-NEXT: br i1 %cond, label %L0, label %[[THREADED:[A-Za-z.0-9]+]]
|
||
|
|
; CHECK: [[THREADED]]:
|
||
|
|
; CHECK-NEXT: call void @quux
|
||
|
|
; CHECK-NEXT: br label %L1
|
||
|
|
define void @test_switch_cmp(i1 %cond, i32 %val, i8 %value) nounwind {
|
||
|
|
entry:
|
||
|
|
br i1 %cond, label %L0, label %L4
|
||
|
|
L0:
|
||
|
|
%val.phi = phi i32 [%val, %entry], [-1, %L4]
|
||
|
|
%cmp = icmp slt i32 %val.phi, 0
|
||
|
|
%expr = select i1 %cmp, i8 1, i8 %value
|
||
|
|
switch i8 %expr, label %L3 [i8 1, label %L1 i8 2, label %L2]
|
||
|
|
|
||
|
|
L1:
|
||
|
|
call void @foo()
|
||
|
|
ret void
|
||
|
|
L2:
|
||
|
|
call void @bar()
|
||
|
|
ret void
|
||
|
|
L3:
|
||
|
|
call void @baz()
|
||
|
|
ret void
|
||
|
|
L4:
|
||
|
|
call void @quux()
|
||
|
|
br label %L0
|
||
|
|
}
|