| ;; 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 |
| |
| ; 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 |
| } |
| |
| ; 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 |
| } |
| |