6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-14 11:32:34 +00:00
Code Issues Projects Releases Wiki Activity

Lower multiply-negate operation to mneg on AArch64

Browse Source 
This patch pattern matches code such as-
neg	 w8, w8
mul	 w8, w9, w8
to
mneg	 w8, w8, w9

Review: http://reviews.llvm.org/D6754



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224706 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Karthik Bhat 2014-12-22 13:38:58 +00:00
parent b646a4b0b8
commit 0c2590a266
2 changed files with 19 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
lib/Target/AArch64/AArch64InstrInfo.td
View File

@ -657,6 +657,10 @@ def : Pat<(i32 (ineg (mul GPR32:$Rn, GPR32:$Rm))),
(MSUBWrrr GPR32:$Rn, GPR32:$Rm, WZR)>;
def : Pat<(i64 (ineg (mul GPR64:$Rn, GPR64:$Rm))),
(MSUBXrrr GPR64:$Rn, GPR64:$Rm, XZR)>;
def : Pat<(i32 (mul (ineg GPR32:$Rn), GPR32:$Rm)),
(MSUBWrrr GPR32:$Rn, GPR32:$Rm, WZR)>;
def : Pat<(i64 (mul (ineg GPR64:$Rn), GPR64:$Rm)),
(MSUBXrrr GPR64:$Rn, GPR64:$Rm, XZR)>;
} // AddedComplexity = 7
let AddedComplexity = 5 in {

15
test/CodeGen/AArch64/dp-3source.ll
View File

@ -161,3 +161,18 @@ define i64 @test_umnegl(i32 %lhs, i32 %rhs) {
; CHECK: umnegl {{x[0-9]+}}, {{w[0-9]+}}, {{w[0-9]+}}
ret i64 %res
}
@a = common global i32 0, align 4
@b = common global i32 0, align 4
@c = common global i32 0, align 4
define void @test_mneg(){
; CHECK-LABEL: test_mneg:
%1 = load i32* @a, align 4
%2 = load i32* @b, align 4
%3 = sub i32 0, %1
%4 = mul i32 %2, %3
store i32 %4, i32* @c, align 4
; CHECK: mneg {{w[0-9]+}}, {{w[0-9]+}}, {{w[0-9]+}}
ret void
}