mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-23 11:13:28 +01:00
36b572f1e0
This patch handles 64-bit constants which can be encoded as 32-bit immediates. It extends the functionality added by https://reviews.llvm.org/D11363 for 32-bit constants to 64-bit constants. Patch by Sunita Marathe! Differential Revision: https://reviews.llvm.org/D23391 llvm-svn: 278857
39 lines
1.2 KiB
LLVM
39 lines
1.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
|
|
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
|
|
|
|
; Check that multiple instances of 64-bit constants encodable as
|
|
; 32-bit immediates are merged for code size savings.
|
|
|
|
; Immediates with multiple users should not be pulled into instructions when
|
|
; optimizing for code size.
|
|
define i1 @imm_multiple_users(i64 %a, i64* %b) optsize {
|
|
; CHECK-LABEL: imm_multiple_users:
|
|
; CHECK: # BB#0:
|
|
; CHECK-NEXT: movq $-1, %rax
|
|
; CHECK-NEXT: movq %rax, (%rsi)
|
|
; CHECK-NEXT: cmpq %rax, %rdi
|
|
; CHECK-NEXT: sete %al
|
|
; CHECK-NEXT: retq
|
|
;
|
|
store i64 -1, i64* %b, align 8
|
|
%cmp = icmp eq i64 %a, -1
|
|
ret i1 %cmp
|
|
}
|
|
|
|
declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1)
|
|
|
|
; Inlined memsets requiring multiple same-sized stores should be lowered using
|
|
; the register, rather than immediate, form of stores when optimizing for
|
|
; code size.
|
|
define void @memset_zero(i8* noalias nocapture %D) optsize {
|
|
; CHECK-LABEL: memset_zero:
|
|
; CHECK: # BB#0:
|
|
; CHECK-NEXT: xorl %eax, %eax
|
|
; CHECK-NEXT: movq %rax, 7(%rdi)
|
|
; CHECK-NEXT: movq %rax, (%rdi)
|
|
; CHECK-NEXT: retq
|
|
;
|
|
tail call void @llvm.memset.p0i8.i64(i8* %D, i8 0, i64 15, i32 1, i1 false)
|
|
ret void
|
|
}
|