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author | Chris Lattner <sabre@nondot.org> | 2010-12-13 08:39:01 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2010-12-13 08:39:01 +0000 |
commit | de1c3605a649239cf8a96ba31885c8fbef2bc838 (patch) | |
tree | 4b2933b6d4e162daba87f508642c62d0d6ed4d10 /test | |
parent | a9f6bbea62f42ab052eca423588e309ab67c3fa3 (diff) | |
download | llvm-de1c3605a649239cf8a96ba31885c8fbef2bc838.tar.gz llvm-de1c3605a649239cf8a96ba31885c8fbef2bc838.tar.bz2 llvm-de1c3605a649239cf8a96ba31885c8fbef2bc838.tar.xz |
Add a couple dag combines to transform mulhi/mullo into a wider multiply
when the wider type is legal. This allows us to compile:
define zeroext i16 @test1(i16 zeroext %x) nounwind {
entry:
%div = udiv i16 %x, 33
ret i16 %div
}
into:
test1: # @test1
movzwl 4(%esp), %eax
imull $63551, %eax, %eax # imm = 0xF83F
shrl $21, %eax
ret
instead of:
test1: # @test1
movw $-1985, %ax # imm = 0xFFFFFFFFFFFFF83F
mulw 4(%esp)
andl $65504, %edx # imm = 0xFFE0
movl %edx, %eax
shrl $5, %eax
ret
Implementing rdar://8760399 and example #4 from:
http://blog.regehr.org/archives/320
We should implement the same thing for [su]mul_hilo, but I don't
have immediate plans to do this.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121696 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
-rw-r--r-- | test/CodeGen/X86/2008-11-29-DivideConstant16bit.ll | 39 | ||||
-rw-r--r-- | test/CodeGen/X86/2008-11-29-DivideConstant16bitSigned.ll | 9 |
2 files changed, 36 insertions, 12 deletions
diff --git a/test/CodeGen/X86/2008-11-29-DivideConstant16bit.ll b/test/CodeGen/X86/2008-11-29-DivideConstant16bit.ll index 2e114ab5ae..6b423a167c 100644 --- a/test/CodeGen/X86/2008-11-29-DivideConstant16bit.ll +++ b/test/CodeGen/X86/2008-11-29-DivideConstant16bit.ll @@ -1,9 +1,42 @@ -; RUN: llc < %s -mtriple=i686-pc-linux-gnu | grep -- -1985 | count 1 +; RUN: llc < %s -mtriple=i686-pc-linux-gnu -asm-verbose=0 | FileCheck %s target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32" target triple = "i686-pc-linux-gnu" -define zeroext i16 @a(i16 zeroext %x) nounwind { +define zeroext i16 @test1(i16 zeroext %x) nounwind { entry: - %div = udiv i16 %x, 33 ; <i32> [#uses=1] + %div = udiv i16 %x, 33 + ret i16 %div +; CHECK: test1: +; CHECK: imull $63551, %eax, %eax +; CHECK-NEXT: shrl $21, %eax +; CHECK-NEXT: ret +} + +define zeroext i16 @test2(i8 signext %x, i16 zeroext %c) nounwind readnone ssp noredzone { +entry: + %div = udiv i16 %c, 3 + ret i16 %div + +; CHECK: test2: +; CHECK: imull $43691, %eax, %eax +; CHECK-NEXT: shrl $17, %eax +; CHECK-NEXT: ret +} + +define zeroext i8 @test3(i8 zeroext %x, i8 zeroext %c) nounwind readnone ssp noredzone { +entry: + %div = udiv i8 %c, 3 + ret i8 %div + +; CHECK: test3: +; CHECK: imull $171, %eax, %eax +; CHECK-NEXT: shrb %ah +; CHECK-NEXT: movzbl %ah, %eax +; CHECK-NEXT: ret +} + +define signext i16 @test4(i16 signext %x) nounwind { +entry: + %div = sdiv i16 %x, 33 ; <i32> [#uses=1] ret i16 %div } diff --git a/test/CodeGen/X86/2008-11-29-DivideConstant16bitSigned.ll b/test/CodeGen/X86/2008-11-29-DivideConstant16bitSigned.ll deleted file mode 100644 index 7c811afa51..0000000000 --- a/test/CodeGen/X86/2008-11-29-DivideConstant16bitSigned.ll +++ /dev/null @@ -1,9 +0,0 @@ -; RUN: llc < %s -mtriple=i686-pc-linux-gnu | grep -- -1985 -target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32" -target triple = "i686-pc-linux-gnu" - -define signext i16 @a(i16 signext %x) nounwind { -entry: - %div = sdiv i16 %x, 33 ; <i32> [#uses=1] - ret i16 %div -} |