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