| Kevin B. Smith | ed0b620 | 2016-05-31 22:00:12 +0000 | [diff] [blame] | 1 | ; RUN: llc -march=x86 -stop-after expand-isel-pseudos <%s 2>&1 | FileCheck %s |
| 2 | |
| 3 | target datalayout = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128" |
| 4 | target triple = "i386-unknown-linux-gnu" |
| 5 | |
| 6 | ; This test checks to make sure the lshr in %then1 block gets expanded using |
| 7 | ; GR16_ABCD pattern rather than GR32_ABCD pattern. By using the 16-bit pattern |
| 8 | ; this doesn't make the register liveness information look like the whole |
| 9 | ; 32-bit register is a live value, and allows generally better live register |
| 10 | ; analysis. |
| 11 | ; CHECK-LABEL: bb.1.then1: |
| 12 | ; CHECK-NOT: IMPLICIT_DEF |
| 13 | ; CHECK-NOT: INSERT_SUBREG |
| 14 | ; CHECK: sub_8bit_hi |
| 15 | ; CHECK-LABEL: bb.2.endif1: |
| 16 | |
| 17 | define i16 @foo4(i32 %prec, i8 *%dst, i16 *%src) { |
| 18 | entry: |
| 19 | %cnd = icmp ne i32 %prec, 0 |
| 20 | %t0 = load i16, i16 *%src, align 2 |
| 21 | br i1 %cnd, label %then1, label %endif1 |
| 22 | |
| 23 | then1: |
| 24 | %shr = lshr i16 %t0, 8 |
| 25 | %conv = trunc i16 %shr to i8 |
| 26 | store i8 %conv, i8 *%dst, align 1 |
| 27 | br label %endif1 |
| 28 | |
| 29 | endif1: |
| 30 | %t2 = phi i16 [0, %then1], [%t0, %entry] |
| 31 | ret i16 %t2 |
| 32 | } |