mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 04:30:12 +00:00
7c9c6ed761
Essentially the same as the GEP change in r230786.
A similar migration script can be used to update test cases, though a few more
test case improvements/changes were required this time around: (r229269-r229278)
import fileinput
import sys
import re
pat = re.compile(r"((?:=|:|^)\s*load (?:atomic )?(?:volatile )?(.*?))(| addrspace\(\d+\) *)\*($| *(?:%|@|null|undef|blockaddress|getelementptr|addrspacecast|bitcast|inttoptr|\[\[[a-zA-Z]|\{\{).*$)")
for line in sys.stdin:
sys.stdout.write(re.sub(pat, r"\1, \2\3*\4", line))
Reviewers: rafael, dexonsmith, grosser
Differential Revision: http://reviews.llvm.org/D7649
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230794 91177308-0d34-0410-b5e6-96231b3b80d8
155 lines
3.3 KiB
LLVM
155 lines
3.3 KiB
LLVM
; bswap should be constant folded when it is passed a constant argument
|
|
|
|
; RUN: llc < %s -march=x86 -mcpu=i686 | FileCheck %s
|
|
; RUN: llc < %s -march=x86-64 | FileCheck %s --check-prefix=CHECK64
|
|
|
|
declare i16 @llvm.bswap.i16(i16)
|
|
|
|
declare i32 @llvm.bswap.i32(i32)
|
|
|
|
declare i64 @llvm.bswap.i64(i64)
|
|
|
|
define i16 @W(i16 %A) {
|
|
; CHECK-LABEL: W:
|
|
; CHECK: rolw $8, %ax
|
|
|
|
; CHECK64-LABEL: W:
|
|
; CHECK64: rolw $8, %
|
|
%Z = call i16 @llvm.bswap.i16( i16 %A ) ; <i16> [#uses=1]
|
|
ret i16 %Z
|
|
}
|
|
|
|
define i32 @X(i32 %A) {
|
|
; CHECK-LABEL: X:
|
|
; CHECK: bswapl %eax
|
|
|
|
; CHECK64-LABEL: X:
|
|
; CHECK64: bswapl %
|
|
%Z = call i32 @llvm.bswap.i32( i32 %A ) ; <i32> [#uses=1]
|
|
ret i32 %Z
|
|
}
|
|
|
|
define i64 @Y(i64 %A) {
|
|
; CHECK-LABEL: Y:
|
|
; CHECK: bswapl %eax
|
|
; CHECK: bswapl %edx
|
|
|
|
; CHECK64-LABEL: Y:
|
|
; CHECK64: bswapq %
|
|
%Z = call i64 @llvm.bswap.i64( i64 %A ) ; <i64> [#uses=1]
|
|
ret i64 %Z
|
|
}
|
|
|
|
; rdar://9164521
|
|
define i32 @test1(i32 %a) nounwind readnone {
|
|
entry:
|
|
; CHECK-LABEL: test1:
|
|
; CHECK: bswapl [[REG:%.*]]
|
|
; CHECK: shrl $16, [[REG]]
|
|
|
|
; CHECK64-LABEL: test1:
|
|
; CHECK64: bswapl [[REG:%.*]]
|
|
; CHECK64: shrl $16, [[REG]]
|
|
%and = lshr i32 %a, 8
|
|
%shr3 = and i32 %and, 255
|
|
%and2 = shl i32 %a, 8
|
|
%shl = and i32 %and2, 65280
|
|
%or = or i32 %shr3, %shl
|
|
ret i32 %or
|
|
}
|
|
|
|
define i32 @test2(i32 %a) nounwind readnone {
|
|
entry:
|
|
; CHECK-LABEL: test2:
|
|
; CHECK: bswapl [[REG:%.*]]
|
|
; CHECK: sarl $16, [[REG]]
|
|
|
|
; CHECK64-LABEL: test2:
|
|
; CHECK64: bswapl [[REG:%.*]]
|
|
; CHECK64: sarl $16, [[REG]]
|
|
%and = lshr i32 %a, 8
|
|
%shr4 = and i32 %and, 255
|
|
%and2 = shl i32 %a, 8
|
|
%or = or i32 %shr4, %and2
|
|
%sext = shl i32 %or, 16
|
|
%conv3 = ashr exact i32 %sext, 16
|
|
ret i32 %conv3
|
|
}
|
|
|
|
@var8 = global i8 0
|
|
@var16 = global i16 0
|
|
|
|
; The "shl" below can move bits into the high parts of the value, so the
|
|
; operation is not a "bswap, shr" pair.
|
|
|
|
; rdar://problem/14814049
|
|
define i64 @not_bswap() {
|
|
; CHECK-LABEL: not_bswap:
|
|
; CHECK-NOT: bswapl
|
|
; CHECK: ret
|
|
|
|
; CHECK64-LABEL: not_bswap:
|
|
; CHECK64-NOT: bswapq
|
|
; CHECK64: ret
|
|
%init = load i16, i16* @var16
|
|
%big = zext i16 %init to i64
|
|
|
|
%hishifted = lshr i64 %big, 8
|
|
%loshifted = shl i64 %big, 8
|
|
|
|
%notswapped = or i64 %hishifted, %loshifted
|
|
|
|
ret i64 %notswapped
|
|
}
|
|
|
|
; This time, the lshr (and subsequent or) is completely useless. While it's
|
|
; technically correct to convert this into a "bswap, shr", it's suboptimal. A
|
|
; simple shl works better.
|
|
|
|
define i64 @not_useful_bswap() {
|
|
; CHECK-LABEL: not_useful_bswap:
|
|
; CHECK-NOT: bswapl
|
|
; CHECK: ret
|
|
|
|
; CHECK64-LABEL: not_useful_bswap:
|
|
; CHECK64-NOT: bswapq
|
|
; CHECK64: ret
|
|
|
|
%init = load i8, i8* @var8
|
|
%big = zext i8 %init to i64
|
|
|
|
%hishifted = lshr i64 %big, 8
|
|
%loshifted = shl i64 %big, 8
|
|
|
|
%notswapped = or i64 %hishifted, %loshifted
|
|
|
|
ret i64 %notswapped
|
|
}
|
|
|
|
; Finally, it *is* OK to just mask off the shl if we know that the value is zero
|
|
; beyond 16 bits anyway. This is a legitimate bswap.
|
|
|
|
define i64 @finally_useful_bswap() {
|
|
; CHECK-LABEL: finally_useful_bswap:
|
|
; CHECK: bswapl [[REG:%.*]]
|
|
; CHECK: shrl $16, [[REG]]
|
|
; CHECK: ret
|
|
|
|
; CHECK64-LABEL: finally_useful_bswap:
|
|
; CHECK64: bswapq [[REG:%.*]]
|
|
; CHECK64: shrq $48, [[REG]]
|
|
; CHECK64: ret
|
|
|
|
%init = load i16, i16* @var16
|
|
%big = zext i16 %init to i64
|
|
|
|
%hishifted = lshr i64 %big, 8
|
|
%lomasked = and i64 %big, 255
|
|
%loshifted = shl i64 %lomasked, 8
|
|
|
|
%swapped = or i64 %hishifted, %loshifted
|
|
|
|
ret i64 %swapped
|
|
}
|
|
|