mirror of
https://github.com/c64scene-ar/llvm-6502.git
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26e097ca4b
When it sees a promising select it now tries to figure out whether the condition of the select is known in any of the predecessors and if so it maps the operands appropriately. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121859 91177308-0d34-0410-b5e6-96231b3b80d8
124 lines
2.7 KiB
LLVM
124 lines
2.7 KiB
LLVM
; RUN: opt -S -jump-threading < %s | FileCheck %s
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declare void @foo()
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declare void @bar()
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declare void @baz()
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declare void @quux()
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; Jump threading of branch with select as condition.
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; Mostly theoretical since instruction combining simplifies all selects of
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; booleans where at least one operand is true/false/undef.
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; CHECK: @test_br
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 %cond, label %L1,
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define void @test_br(i1 %cond, i1 %value) nounwind {
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entry:
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br i1 %cond, label %L0, label %L3
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L0:
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%expr = select i1 %cond, i1 true, i1 %value
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br i1 %expr, label %L1, label %L2
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L1:
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call void @foo()
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ret void
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L2:
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call void @bar()
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ret void
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L3:
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call void @baz()
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br label %L0
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}
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; Jump threading of switch with select as condition.
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; CHECK: @test_switch
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 %cond, label %L1,
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define void @test_switch(i1 %cond, i8 %value) nounwind {
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entry:
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br i1 %cond, label %L0, label %L4
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L0:
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%expr = select i1 %cond, i8 1, i8 %value
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switch i8 %expr, label %L3 [i8 1, label %L1 i8 2, label %L2]
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L1:
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call void @foo()
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ret void
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L2:
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call void @bar()
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ret void
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L3:
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call void @baz()
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ret void
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L4:
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call void @quux()
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br label %L0
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}
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; Make sure the blocks in the indirectbr test aren't trivially removable as
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; successors by taking their addresses.
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@anchor = constant [3 x i8*] [
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i8* blockaddress(@test_indirectbr, %L1),
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i8* blockaddress(@test_indirectbr, %L2),
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i8* blockaddress(@test_indirectbr, %L3)
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]
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; Jump threading of indirectbr with select as address.
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; CHECK: @test_indirectbr
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 %cond, label %L1, label %L3
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define void @test_indirectbr(i1 %cond, i8* %address) nounwind {
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entry:
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br i1 %cond, label %L0, label %L3
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L0:
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%indirect.goto.dest = select i1 %cond, i8* blockaddress(@test_indirectbr, %L1), i8* %address
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indirectbr i8* %indirect.goto.dest, [label %L1, label %L2, label %L3]
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L1:
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call void @foo()
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ret void
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L2:
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call void @bar()
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ret void
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L3:
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call void @baz()
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ret void
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}
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; A more complicated case: the condition is a select based on a comparison.
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; CHECK: @test_switch_cmp
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 %cond, label %L0, label %[[THREADED:[A-Za-z.0-9]+]]
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; CHECK: [[THREADED]]:
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; CHECK-NEXT: call void @quux
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; CHECK-NEXT: br label %L1
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define void @test_switch_cmp(i1 %cond, i32 %val, i8 %value) nounwind {
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entry:
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br i1 %cond, label %L0, label %L4
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L0:
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%val.phi = phi i32 [%val, %entry], [-1, %L4]
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%cmp = icmp slt i32 %val.phi, 0
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%expr = select i1 %cmp, i8 1, i8 %value
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switch i8 %expr, label %L3 [i8 1, label %L1 i8 2, label %L2]
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L1:
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call void @foo()
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ret void
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L2:
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call void @bar()
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ret void
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L3:
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call void @baz()
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ret void
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L4:
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call void @quux()
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br label %L0
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}
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