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90e4f16c37
When generating table jump code for switch statements, place the jump table label as the first operand in the various addition instructions in order to enable addressing mode selectors to better match index computation and possibly fold them into the addressing mode of the table entry load instruction. Differential revision: https://reviews.llvm.org/D39752 llvm-svn: 318033
83 lines
2.6 KiB
LLVM
83 lines
2.6 KiB
LLVM
; RUN: llc -mtriple=thumbv8m.base-eabi -mattr=+execute-only %s -o - | FileCheck --check-prefix=CHECK --check-prefix=CHECK-T2BASE %s
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; RUN: llc -mtriple=thumbv7m-eabi -mattr=+execute-only %s -o - | FileCheck --check-prefix=CHECK --check-prefix=CHECK-T2 %s
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; RUN: llc -mtriple=thumbv8m.main-eabi -mattr=+execute-only %s -o - | FileCheck --check-prefix=CHECK --check-prefix=CHECK-T2 %s
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@var = global i32 0
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define i32 @global() minsize {
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; CHECK-LABEL: global:
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; CHECK: movw [[GLOBDEST:r[0-9]+]], :lower16:var
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; CHECK: movt [[GLOBDEST]], :upper16:var
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%val = load i32, i32* @var
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ret i32 %val
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}
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define i32 @jump_table(i32 %c, i32 %a, i32 %b) #0 {
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; CHECK-LABEL: jump_table:
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; CHECK-T2: adr.w [[REG_JT:r[0-9]+]], .LJTI1_0
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; CHECK-T2: add.w [[REG_ENTRY:r[0-9]+]], [[REG_JT]], {{r[0-9]+}}, lsl #2
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; CHECK-T2: mov pc, [[REG_ENTRY]]
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; CHECK-T2BASE: lsls [[REG_OFFSET:r[0-9]+]], {{r[0-9]+}}, #2
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; CHECK-T2BASE: adr [[REG_JT:r[0-9]+]], .LJTI1_0
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; CHECK-T2BASE: adds [[REG_ENTRY:r[0-9]+]], [[REG_JT]], [[REG_OFFSET]]
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; CHECK-T2BASE: mov pc, [[REG_ENTRY]]
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; CHECK-LABEL: .LJTI1_0:
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; CHECK-NEXT: b.w
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; CHECK-NEXT: b.w
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; CHECK-NEXT: b.w
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; CHECK-NEXT: b.w
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; CHECK-NEXT: b.w
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; CHECK-NEXT: b.w
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entry:
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switch i32 %c, label %return [
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i32 1, label %sw.bb
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i32 2, label %sw.bb1
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i32 3, label %sw.bb3
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i32 4, label %sw.bb4
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i32 5, label %sw.bb6
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i32 6, label %sw.bb8
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]
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sw.bb: ; preds = %entry
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%add = add nsw i32 %a, 6
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br label %return
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sw.bb1: ; preds = %entry
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%add2 = add nsw i32 %a, 4
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br label %return
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sw.bb3: ; preds = %entry
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%sub = add nsw i32 %a, -3
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br label %return
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sw.bb4: ; preds = %entry
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%add5 = add nsw i32 %b, 5
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br label %return
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sw.bb6: ; preds = %entry
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%add7 = add nsw i32 %a, 1
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br label %return
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sw.bb8: ; preds = %entry
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%add9 = add nsw i32 %a, 2
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br label %return
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return: ; preds = %entry, %sw.bb8, %sw.bb6, %sw.bb4, %sw.bb3, %sw.bb1, %sw.bb
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%retval.0 = phi i32 [ %add9, %sw.bb8 ], [ %add7, %sw.bb6 ], [ %add5, %sw.bb4 ], [ %sub, %sw.bb3 ], [ %add2, %sw.bb1 ], [ %add, %sw.bb ], [ 0, %entry ]
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ret i32 %retval.0
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}
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@.str = private unnamed_addr constant [4 x i8] c"FOO\00", align 1
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define hidden i8* @string_literal() {
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entry:
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; CHECK-LABEL: string_literal:
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; CHECK-NOT: .asciz
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; CHECK: .fnend
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ret i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i32 0, i32 0)
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}
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