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Diffstat (limited to 'lib/Target/ARM/README-Thumb.txt')
| -rw-r--r-- | lib/Target/ARM/README-Thumb.txt | 9 |
1 files changed, 0 insertions, 9 deletions
diff --git a/lib/Target/ARM/README-Thumb.txt b/lib/Target/ARM/README-Thumb.txt index 8ffe0b17a5..cc017945d8 100644 --- a/lib/Target/ARM/README-Thumb.txt +++ b/lib/Target/ARM/README-Thumb.txt @@ -244,12 +244,3 @@ to toggle the 's' bit since they do not set CPSR when they are inside IT blocks. Make use of hi register variants of cmp: tCMPhir / tCMPZhir. //===---------------------------------------------------------------------===// - -Rather than generating ldrsb, sometimes it's better to select to ldrb + sxtb. -The problem is ldrsb addressing mode [r, r] means the zero offset requires an -extra move. e.g. ldr_ext.ll test3: - movs r1, #0 - ldrsb r0, [r0, r1] -=> - ldrb r0, [r0, #0] - sxtb r0, r0 |