Author: Armin Rigo <[email protected]>
Branch: guard-compatible
Changeset: r84664:a9f396fa0c0d
Date: 2016-05-24 20:51 +0200
http://bitbucket.org/pypy/pypy/changeset/a9f396fa0c0d/
Log: Kill an unnecessary ADD
diff --git a/rpython/jit/backend/x86/guard_compat.py
b/rpython/jit/backend/x86/guard_compat.py
--- a/rpython/jit/backend/x86/guard_compat.py
+++ b/rpython/jit/backend/x86/guard_compat.py
@@ -195,7 +195,9 @@
ofs2 = _real_number(BCLIST + BCLISTITEMSOFS)
mc.MOV_sr(2*WORD, rdx) # MOV [RSP+16], RDX
mc.MOV_rm(r11, (rdx, ofs1)) # MOV R11, [RDX + bc_list.length]
- mc.ADD_ri(rdx, ofs2) # ADD RDX, $bc_list.items
+ # in the sequel, "RDX + bc_list.items" is a pointer to the leftmost
+ # array item of the range still under consideration. The length of
+ # this range is R11, which is always a power-of-two-minus-1.
mc.JMP_l8(0) # JMP loop
jmp_location = mc.get_relative_pos()
mc.force_frame_size(frame_size)
@@ -210,11 +212,12 @@
jz_location = mc.get_relative_pos()
_fix_forward_label(mc, jmp_location) # loop:
- mc.CMP_ra(rax, (rdx, r11, SH, -WORD)) # CMP RAX, [RDX + 8*R11 - 8]
+ mc.CMP_ra(rax, (rdx, r11, SH, ofs2-WORD))
+ # CMP RAX, [RDX + items + 8*R11 -
8]
mc.J_il8(rx86.Conditions['A'], right_label - (mc.get_relative_pos() + 2))
mc.J_il8(rx86.Conditions['NE'], left_label - (mc.get_relative_pos() + 2))
- mc.MOV_ra(r11, (rdx, r11, SH, 0)) # MOV R11, [RDX + 8*R11]
+ mc.MOV_ra(r11, (rdx, r11, SH, ofs2)) # MOV R11, [RDX + items + 8*R11]
mc.MOV_rs(rdx, 2*WORD) # MOV RDX, [RSP+16]
ofs = _real_number(BCMOSTRECENT)
mc.MOV_mr((rdx, ofs), rax) # MOV [RDX+bc_most_recent], RAX
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