commit 3ffdff6448a6b4609071f9a3af4d89b6a5c8103c
author Chris Lattner <sabre@nondot.org> Wed Oct 06 04:19:43 2004 +0000
committer Chris Lattner <sabre@nondot.org> Wed Oct 06 04:19:43 2004 +0000
tree f7f9b4f659cadeabb2c594c2faf2b0fd68388678
parent 610f1e2785d7278175ed6c332840756e20bc1142

Fix a scary bug with signed division by a power of two.  We used to generate:

s:   ;; X / 4
        mov %EAX, DWORD PTR [%ESP + 4]
        mov %ECX, %EAX
        sar %ECX, 1
        shr %ECX, 30
        mov %EDX, %EAX
        add %EDX, %ECX
        sar %EAX, 2
        ret

When we really meant:

s:
        mov %EAX, DWORD PTR [%ESP + 4]
        mov %ECX, %EAX
        sar %ECX, 1
        shr %ECX, 30
        add %EAX, %ECX
        sar %EAX, 2
        ret

Hey, this also reduces register pressure too :)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16761 91177308-0d34-0410-b5e6-96231b3b80d8