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;; x86 is chosen to show the transform when 8-bit and 16-bit registers are available.
; RUN: opt < %s -codegenprepare -S -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefix=X86
; RUN: opt < %s -debugify -codegenprepare -S -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefix=DEBUG
; X86 prefers i32 over i16 for address calculation.
define i32 @widen_switch_i16(i32 %a) {
entry:
%trunc = trunc i32 %a to i16
switch i16 %trunc, label %sw.default [
i16 1, label %sw.bb0
i16 -1, label %sw.bb1
]
sw.bb0:
br label %return
sw.bb1:
br label %return
sw.default:
br label %return
return:
%retval = phi i32 [ -1, %sw.default ], [ 0, %sw.bb0 ], [ 1, %sw.bb1 ]
ret i32 %retval
; X86-LABEL: @widen_switch_i16(
; X86: %trunc = trunc i32 %a to i16
; X86-NEXT: %0 = zext i16 %trunc to i32
; X86-NEXT: switch i32 %0, label %sw.default [
; X86-NEXT: i32 1, label %sw.bb0
; X86-NEXT: i32 65535, label %sw.bb1
}
; Widen to 32-bit from a smaller, non-native type.
define i32 @widen_switch_i17(i32 %a) {
entry:
%trunc = trunc i32 %a to i17
switch i17 %trunc, label %sw.default [
i17 10, label %sw.bb0
i17 -1, label %sw.bb1
]
sw.bb0:
br label %return
sw.bb1:
br label %return
sw.default:
br label %return
return:
%retval = phi i32 [ -1, %sw.default ], [ 0, %sw.bb0 ], [ 1, %sw.bb1 ]
ret i32 %retval
; X86-LABEL: @widen_switch_i17(
; X86: %0 = zext i17 %trunc to i32
; X86-NEXT: switch i32 %0, label %sw.default [
; X86-NEXT: i32 10, label %sw.bb0
; X86-NEXT: i32 131071, label %sw.bb1
; DEBUG-LABEL: @widen_switch_i17(
; DEBUG: zext i17 %trunc to i32, !dbg [[switch_loc:![0-9]+]]
; DEBUG-NEXT: switch i32 {{.*}} [
; DEBUG-NEXT: label %sw.bb0
; DEBUG-NEXT: label %sw.bb1
; DEBUG-NEXT: ], !dbg [[switch_loc]]
}
; If the switch condition is a sign-extended function argument, then the
; condition and cases should be sign-extended rather than zero-extended
; because the sign-extension can be optimized away.
define i32 @widen_switch_i16_sext(i2 signext %a) {
entry:
switch i2 %a, label %sw.default [
i2 1, label %sw.bb0
i2 -1, label %sw.bb1
]
sw.bb0:
br label %return
sw.bb1:
br label %return
sw.default:
br label %return
return:
%retval = phi i32 [ -1, %sw.default ], [ 0, %sw.bb0 ], [ 1, %sw.bb1 ]
ret i32 %retval
; X86-LABEL: @widen_switch_i16_sext(
; X86: %0 = sext i2 %a to i32
; X86-NEXT: switch i32 %0, label %sw.default [
; X86-NEXT: i32 1, label %sw.bb0
; X86-NEXT: i32 -1, label %sw.bb1
}
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