forked from OSchip/llvm-project
104 lines
2.5 KiB
LLVM
104 lines
2.5 KiB
LLVM
|
;; 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
|
||
|
|
|
||
|
|
; No change for x86 because 16-bit registers are part of the architecture.
|
||
|
|
|
||
|
|
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: switch i16 %trunc, label %sw.default [
|
||
|
|
; X86-NEXT: i16 1, label %sw.bb0
|
||
|
|
; X86-NEXT: i16 -1, 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 i8
|
||
|
|
; X86-NEXT: switch i8 %0, label %sw.default [
|
||
|
|
; X86-NEXT: i8 1, label %sw.bb0
|
||
|
|
; X86-NEXT: i8 -1, label %sw.bb1
|
||
|
|
}
|
||
|
|
|