1; RUN: llc -march=x86 -stop-after expand-isel-pseudos <%s 2>&1 | FileCheck %s
2
3target datalayout = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"
4target 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
17define i16 @foo4(i32 %prec, i8 *%dst, i16 *%src) {
18entry:
19  %cnd = icmp ne i32 %prec, 0
20  %t0 = load i16, i16 *%src, align 2
21  br i1 %cnd, label %then1, label %endif1
22
23then1:
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
29endif1:
30  %t2 = phi i16 [0, %then1], [%t0, %entry]
31  ret i16 %t2
32}
33