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https://github.com/c64scene-ar/llvm-6502.git
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9962fd0e2e
Previously, they were forced to immediately follow the actual branch instruction. This was usually OK (the LEAs actually accessing them got emitted nearby, and weren't usually separated much afterwards). Unfortunately, a sufficiently nasty phi elimination dumps many instructions right before the basic block terminator, and this can increase the range too much. This patch frees them up to be placed as usual by the constant islands pass, and consequently has to slightly modify the form of TBB/TBH tables to refer to a PC-relative label at the final jump. The other jump table formats were already position-independent. rdar://20813304 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237590 91177308-0d34-0410-b5e6-96231b3b80d8
48 lines
819 B
LLVM
48 lines
819 B
LLVM
; RUN: llc < %s -mtriple=thumbv7-linux-gnueabihf -O1 %s -o - | FileCheck %s
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; CHECK-LABEL: test_jump_table:
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; CHECK: b{{.*}} .LBB
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; CHECK-NOT: tbh
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define i32 @test_jump_table(i32 %x, float %in) {
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h1:
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%b0 = fadd float %in, 1234.5
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%b1 = fptoui float %b0 to i32
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switch i32 %x, label %h2 [
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i32 0, label %h3
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i32 2, label %h4
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i32 4, label %h5
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i32 6, label %h6
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]
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h2:
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%a0 = add i32 %x, 5
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br label %h3
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h3:
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%d2 = phi i32 [%b1, %h1], [%a0, %h2]
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%d3 = add i32 %d2, 3
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br label %h4
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h4:
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%c2 = phi i32 [%b1, %h1], [%d3, %h3]
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%c3 = add i32 %c2, 5
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br label %h5
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h5:
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%a2 = phi i32 [%b1, %h1], [%c3, %h4]
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%a3 = add i32 %a2, 6
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br label %h6
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h6:
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%y = phi i32 [0, %h1], [%a3, %h5]
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call i32 @llvm.arm.space(i32 2000, i32 undef)
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ret i32 %y
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}
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declare i32 @llvm.arm.space(i32, i32)
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